Hi! I have a Creative file that means the world to me on my Nintendo Switch, but it's been through a buggy history. The infamous 1.9.0 End Gateway glitch locked me out of accessing it for nearly three months, and when I heard I was gonna be able to access it again when 1.11.0 came out, I was overjoyed. However, playing in the Creative file is now plagued with constant crashing, and I can't seem to understand why. Here is all of the info I have gathered, because I'm determined to have this fixed somehow:
-The crashes do not come from any specific area within the world. They can occur wherever I am. They can even occur when I just boot up the file and stay idle.
-Attempting to "Save and Quit" brings up the Switch's "the software was closed because an error occurred" message. This, along with the fact that it seems to have issues autosaving, leads me to believe that the crashes are originating from the game trying to save when I'm in this file.
-I have an emergency backup of this world, and it doesn't crash at all. It's from November, and I got the main file stuck in the End Gateway in February. Since the crashing only occurs in this main file, I believe having been stuck in the End Gateway for so long permanently screwed it up.
-When my friends try to join the main file (locally, using other controllers), it gives them the notification that they have to pay for Nintendo Switch online, even though it doesn't do that for any of our other files (as I have been subscribed to the Switch Online for a while now). The notification for this appears on the split part of the screen where they would have played from.
-We ported this main file to my friend's phone, and it still crashes there. So it's the file itself that has issues, and not the Switch.
It took a while to gather all of this info, but I figure it will help quite a bit with fixing it. Please, I know the bug-tracking team is busy, but these crashes are making a file that I have spent nearly a year on unplayable. I've waited three months now to have it back to a functional state, and I won't accept losing it.
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Would you be able to provide a copy of the world that is crashing please?
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS.
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.

My friend has a backup of the file on his phone (we used the free trial to set up a Realm), so I’ll see if we can get it uploaded here!

Oh, wait, how did I forget to mention this?
Another strange occurrence (although it never created any issues for us other than being annoying, albeit admittedly hilarious) is that this file has FOUR Ender Dragons. I don’t know how it happened, we have tons of Ender Dragon Skulls and Ender Dragon Eggs littered across the main End Island, but those shouldn’t be able to normally spawn an Ender Dragon. This didn’t occur until about January or so, meaning it was within version 1.9.0.
Last I checked, two health bars popped up, and I’m assuming the other two are there as well. There’s nothing glitchy about these Ender Dragons, it’s just that... there should only be one at a time.
And yes, we have slain the Ender Dragon before in this file, in July or so.
Although this is definitely a glitch, I doubt it’s causing any issues. Just letting you know in case it relates to the file’s corrupted state.
Thank you for your report!
As we're already tracking this issue at MCPE-45862, we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated. (You can provide a copy of the world save there too, if it's available.)
Regarding the multiple ender dragon issue, that is being tracked at MCPE-37590.
Quick Links:
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Thank you so much! Also, my friend was able to painstakingly get the file into a downloadable state. Here it is for testing purposes: https://drive.google.com/drive/folders/1WHkRqy5RBtN-ABBjzYREizN93l7lM4Xh
Many thanks!

Anytime! And many thanks to you! Best of luck with solving this!
Sounds like a similar issue to whats happening to me. Check MCPE-45862