Slim skin model appears as original skin model

Can you provide more information? What exactly doesn't work with the skin?

Same thing is happening with me, I upload an alex model skin and when I log in game it is a Steve model. It is happening for all my friends as well

Same thing is happening with me. Please fix it. Thanks!

Totally the same is happening to me.

Even trying to change my skin doesn't work.

Yes, the same thing is happening to me and it's so frustrating. Basically the skin has black pixels down the side of the arm because it keeps changing the skin to fit the Steve Model rather than the Alex model! Please fix this soon!

Probably caused by the fix for MC-180168.

When requesting skin data for a slim model, for example through https://sessionserver.mojang.com/session/minecraft/profile/ec561538f3fd461daff5086b22154bce, the encoded json object is missing the skin information.

{
  "timestamp" : 1587742753998,
  "profileId" : "ec561538f3fd461daff5086b22154bce",
  "profileName" : "Alex",
  "textures" : { }
}

I also have the same problem. When i put my slim skin it changes to steve hands automatically😞

Same thing for me. I tried to switch versions, didn't work. So i tried to log out of my account and log in back, didn't work. Please fix it!!

NOTE: This is an issue that persists to pretty much any version with Alex and Steve character models, not just 1.15.2 and snapshots.

Same here.

I've been having the same problem where my skin is on slim, but it shows up as classic, with the black bars.

My skin is doing the same thing... Slim skins load just like a Normal skin would...

This is happening to me too

It affected all versions and slim still doesn't work...

I am now also having this problem and my sister. We got on and our skins were not changed and it went to the Steve model. We tried changing our skins and didn't solve the problem. i even reset the game and didn't help us either. if you could please fix it. thank you! 🙂

What are we supposed to do with the information mentioned in the json file? Can you please provide what is the file that is missing that information and where the data is missed?

omg the same is happening to me! I thought it was just me and I got really scared, hopefully they fix this ): 

I have the same thing...

Same, even on the site NameMC it shows skins with slim selected wrong. Maybe "slim" is saved as "classic" when uploading a new skin?

What are we supposed to do with the information mentioned in the json file? Can you please provide what is the file that is missing that information and where the data is missed? (Eli said this but I thought it should be said again because I'm wondering the same thing, what do u want  us to do with the json file also please fix this soon..)

Also for example if u are on Name MC and u go to a skin with the slim and click it at first it shows the steve arms not the slim arms and then when u hover over it, it shows the alex arms. that's so weird. I thought maybe its just a prob w name mc bc i get the skins from there but then i used a dif site n it still doesnt work... please fix i look stupid lol

This seems to be a widepread issue for most/all users - please upvote if you are having this issue, and only comment if you have additional information that could help resolve this issue.
Thank you 🙂

I have the same problem. Here's my experience with it.

I last updated my skin a few weeks ago. The problem only appeared today.
I go into a singleplayer world, no texture packs, no mods (no OptiFine), 1.15.2, and what happens is in the 2 photos I attached (using F5 to look at myself from the back). I also attached the skin file.
I went back and reuploaded the skin to both minecraft . net and to the launcher, waited half an hour, no change.

Anyway, hopefully this gets resolved soon and I love seeing how the community jumps on stuff like that to deal with it as soon as possible. Good luck, and hopefully my images help.
I also attached an image showing that when I go into the "skin" section of my Minecraft profile, I see the model selected being "Classic", even if I already uploaded a skin there after selecting "Slim". This might be unrelated, but worth a look IMO.

This also appears to be happening to me in all versions of Minecraft that had the Alex model, even 1.9. This also might just be me, but it is happening to me.

Sorry for the follow-up, but it seems like some of the images I attached don't show fully (at least on some resolutions - so open them in a new tab if you're using them to try resolve the issue.

in both sp and premium servers the skin with which you log is steve's

I wanted to see if this is really that widespread - so I logged onto Hypixel, a server that uses 1.8 PvP so it's likely for its players to go between 1.8 (no Alex model) and a later version (with Alex model) where they play in singleplayer.

My expectations were confirmed - lots of players with the same skin problem. This is a big thing.

This happens on all versions that has the steve and alex models, not just 1.15.2 and 1.16 snapshots.

The same issue is happening in 1.12.2.

I hope I can add a little bit of extra information.

Today I tried to change my skin, got the same problem, at first I thought I did something wrong so I decided to change back to my old skin, and even my old skin is affected.

Before I decided to change up my skin for a change, nothing was wrong, no black lines, no issues, I change it to a new one, got the glitch immediately, changed it back, glitch still maintains, redownloaded the skin, problem still persists.

I play vanilla on 1.15.2, I hope this added information will help.

This morning, I logged onto Hypixel and saw that I had the black lines as it was displaying as a 4 pixel skin instead of a 3 pixel skin. At first, I thought it was just me and uploaded it as slim again but it was still in the 4 pixel model. I went on NameMC and saw it was 4 pixels on there as well. I then checked every other slim skin that people had applied and they also had 4 pixels. I play Badlion Client on 1.8.9 but it is also broken on vanilla.

Trying to delete Minecraft, switching skins, reuploading skins, wiping files, switching versions, and not playing with mods will NOT work. I have already tried all of this when I was convinced this was a problem with only me after no one responding to my questions on servers, the best thing to do is wait and not to jeopardize your saves and time while doing the things above. Hope this helps for the people who love Alex formatting too much.

The same thing happend to me. Here's more information I have found.

At first,I uploaded a skin file named A.png, and then there is the glitch. I tried to upload another skin file named B.png, but it did not work. However, if I make changes on A.png and upload it, its changed textures can be displayed, but the model still incorrect.

So, there is a problem that you can cover the file you uploaded before, but you cant upload a new skin file.

If this is any help, I began to have issues with my skin last night and the end of yesterday. Going from Alex to Alex skin was the main issue, resulting in either a steve skin model instead of an Alex or just not changing at all. I was able to fix this through restarting my laptop and immediately uploading a new version of  the skin I wanted on the launcher. 

However this morning when I logged back on to my server, my method no longer worked. It seems that the Alex model itself is inaccessible. Hope this helps~

((edit: I just noticed I still have difficulty even changing the skin at all)

the bug also happens in 1.12.2

Issue is happening foe me. I tried re uploading my skin through the launcher and the website but my skin stays the classic model.

same

Just had a thought that might help - If the Minecraft Wiki isn't lying to me and the Alex model was added in 1.8 pre-1, then switching between a version before the addition of Alex and one that's after it has nothing to do with the issue. I, and probably most Hypixel players, only switch between a newer version and 1.8/1.8.9, which are after the addition of Alex as well - and we're still getting the issue.

So it seems like the "switching through versions" that was reported by the original reporter has nothing to do with the issue.

I have that problem in 1.8.9 too.

I am no longer experiencing this issue as I now have a normal alex model applied to my skin.

the black lines on my own skin is gone, but other players still seem to have them

im not having the same problem anymore as well. the slim type seems to be staying as slim and not classic.

Can confirm, the issue is fixed for me as well. Thank you dev team! Anyway, can all of you please test if you still have it? Maybe reupload the skin to minecraft net and the launcher to be sure.

Also fixed for me, did not need to do anything to see the change.

Omg yay! it's fixed for me!! Thank you mojang!!