I made a account a while ago.
Installed addons, skin packs, worlds from marketplace.
Caused issues.
Examples are below.
Not connecting to world, realms, or servers as intended.
Game Freezes because of marketplace content.
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So to summarize the issue here is the problems. In this report i made it has 2 issues that are being cause by the same thing. The problem is when you have a group of addons added to your Minecraft account the game will freeze up around every 20 seconds and it will stay froze for around 5-3 seconds. My other issue is connection issues being caused by addons/marketplace content. I ran a bunch of test and i wrote about them in the big text below. To summarize my test i had 3 accounts 1 being my main. I found this was being caused by addons by accident, I made a new account because i wanted to get rid of the issues i was having which are the Micro Lag and the Connection Issues. I will show examples of both below. On my alt account i didn't install any marketplace content and played with it for around a week and a half. i noticed that i was able to join all games, realms, and servers almost 100% of the time. But the game was telling me that it was a "connection issue" so that's what i thought it was, but i found out it wasn't my connection at all. So i ran a few test, long story short once i installed some skin packs, global resource packs, and addons my alt accounts game began to do the same thing as my main. Both of the issues got worse with the more connect installed. I will now post the pictures and videos of the issues below.
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So what happens is the game freezes every 20 secs for about 3 sec and sometimes it can go higher depending on how many addons you have downloaded. This also happens with marketplace stuff and i think buying a bunch of skin packs effects it to. I have ran a bunch of test by making a bunch of fresh accounts and testing it. if you have no addons or nothing bought from the marketplace it runs amazing. But when i installed addons on another account i started to get to lag again. And ALSO this effects connected to realms, servers, and your friends worlds as well, so i tested connected to realms, servers, and my friends world 100 times without addons and 100 with addons. in the test where i did it WITHOUT addons it joined perfect besides one time with my friend out of 100 but i think i was cause of his wifi, anyways. When i did it with the addons i had a lot of problems this happened with servers, realms, and friends worlds, when ran Minecraft on the account with addons i wouldn't let me join ANYTHING i kept trying to join servers for about 60 try's and couldn't get in a single time so i decided to try realms, so i tried for about 30 try's and i couldn't get in so i tried doing a trick to get in, so what i did is i click the realm and as soon as the "cancel" option showed up i closed it and tried to rejoin the realm as fast as i could and it worked, but i would always say "oops ! Your Microsoft account was disconnected to invite more players, sign in on the main menu and restart your world" and it would kick me out after 30 seconds of playing and this would help me get into realms 100% of the time. so i decided to try my friends world and after around 30 try's i gave up, i reset my game and kept joining and it didn't work, i also logged out and logged back in and it still didn't work. i went offline and online and still nothing. so i just went back to trying to joining and leaving and after around 50 try's and a lot of time i finally got in. now im guessing that the more addons you have the harder the micro lag is and the connection issues are. i don't know if its the size of the addons or just the number of addons but this is a huge bug and i have a lot of friends who just shrug it off as there internet but on a alt account it works fine. thanks for reading this and please don't just say its a copy. i have spent hours looking on here and nothing matches this. thank you <3
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Having a very long description as you have provided makes it difficult to follow and understand exactly how to reproduce the problem.
Please clarify the Description section above using this format:
Steps to Reproduce:
1. (be complete and precise so someone else can repeat your exact steps)
2.
3.
Observed Results:
(briefly describe what actually happens, including all message(s) shown)
Expected Results:
(briefly describe what should happen)
(attach screenshot to help explain the issue)
Be sure to specify exactly what add-ons you tried so someone else can do the exact same steps.
This ticket has been temporarily closed as Awaiting Response. It will automatically reopen when you add information. Please follow the format shown and include all sections (steps, observed, expected). Tickets that do not contain enough information may be closed as Incomplete.

As requested previously, please follow the specific format for reporting.
Do not write a single long paragraph and be sure to provide a clear list of steps.

i did follow the format. i left the old paragraph cause i described everything i did in order. ill make it a list but ima keep the text just in case

also i had to trim the clips down but the lag in the 9.5mb video is not cause of it being recorded. this happens in games all the time but i had to trim it under 10 mb to upload

Thank you for clarifying. Based on the additional information from the screenshot and videos, it appears that you are experiencing at least two issues that have already been reported.
REALMS-6075 - Get "Unable to connect, please check your internet"
MCPE-105892 - General lag issues with 1.16.200+ are tracked here
This report is being resolved as a duplicate.
If you believe that MarketPlace content is related, please feel free to add this information to either of these existing reports. However, if you do so, please specify the exact MarketPlace content you have used so somebody can actually try it.
You might also want to see Writing Helpful Bug Reports.

like i said. my friends have had the same issue and tested it. i really want this fixed and if i add this info to the other issues you gave me i don't think it will be noticed at all and this bug is still going to effect me and a bunch of other players who have no idea what's causing it. i know this is the issue its not something to do with my internet. i have spent HOURS doing my test to make sure this is what is happening. please just read through my report and not just look at the video and picture. the "check your connection" menu error is made because it believes its a connection error. Im telling you that it has nothing to do with my internet and that marketplace content causes this. im tired of making countless accounts just to play Minecraft with my friends and have a good time. sorry for the trouble

and reading the Writing Helpful Bug Reports. shows to me that you didn't read my report. i explained everything step by step and doing multiple test and telling you what happened during my test. If you want proof ill spend another couple weeks making clips and making accounts for no reason just to get this fixed because I've spent my own money on marketplace items and in return i get a buggy unplayable game that i cant even play with my friends in.

For local worlds (not Realms), MCPE-101291 might also be the issue you are experiencing.

Despite your claim to the contrary, you have not followed the instructions in Writing Helpful Bug Reports. What we ask you for there is very simple: A list of steps we can take to reproduce your problem, and statements of what you expected to happen as a result and what actually happened that you didn't expect and believe was wrong. You have replied with assertions that it affects your friends, that you want it fixed, and that you "know" (how?) it has nothing to do with the internet. You claim to have performed multiple experiments, but you haven't described them or the results in any way we can understand enough to try and reproduce. None of this is relevant to what we asked you for.
Since you appear to be unable or unwilling to comply with our instructions and continue to repeat information we've already said we don't understand, including a duplicate report of this issue (MCPE-115840) and repetitious comments in both of the possibly duplicate reports we mentioned (MCPE-105892 and REALMS-6075), we are unable to continue trying to help you with this report, assuming that what you're trying to describe is even a bug at all. Perhaps you might like to ask one of the friends you say is experiencing this problem to report it instead; we might have more success understanding them.
Incidentally, there are hints that you don't understand how this site works, so let me explain. The staff here are not Mojang employees, we are community volunteers. What we do is help players edit their reports to include the information Mojang needs to be able to work on the bug. Mojang needs the reproduction steps because they can't fix a bug if they can't make it happen in the first place. They need to know what you expected to happen in case you've based that on a misunderstanding (in which case it's not a bug), and they need to know what actually happens so they know when they're reproducing the bug you've reported.
The bug tracker staff does not work on fixing bugs, and we have no control over when Mojang schedules work to be done on them. We also don't get status updates while work is in progress, so we can't answer any questions about why it's taking so long or when it will be fixed. Once we've turned a bug report over to Mojang, we usually don't hear anything else about it until it shows up as fixed on the changelog.

what is supposed to happen is i should be able to join servers, realms, and my friends world first try and if not at least the second time around. but instead i have to keep closing my game and reopening it hoping that i can play Minecraft. and if you want to replicate it you just need to download anything from the marketplace and it will start happening. the more you download/buy the more buggy it gets. i not trying to sound rude to yall cause i know your just volunteers but I've been dealing with this for so long and i really love Minecraft and it sucks that i have to even do this in the first place. "You have replied with assertions that it affects your friends, that you want it fixed, and that you "know" (how?) it has nothing to do with the internet." we talk in Xbox parties and the reason i say it has nothing to do with the internet cause it happens when im offline and the "unable to connect to the internet. Please check you internet and try again" error tells me its something to do with my internet but when i log into another account it works first try no problems. i will post everything i downloaded if that will help. i think where your getting lost is this is the only cause for this and nothing else. it has nothing to do with anything else, this only happens when you install marketplace content. but ill ask my friend to make a report to. just sucks that this will probably never be fixed. but thanks for responding. I've just spent hours on worlds and it sucks that i cant play them without worrying if my game is going to crash every 20 seconds. anyways. thanks you don't have to respond. take care