Hello. This bug is in the game for a long time.
If you have a world over 280MB the world cannot be opend.
This is the progress of the bug.
1 - I opend my world in the world lists.
2 - It says for almost 5 minutes that it is loading the resource packs.
3 - After 4 or 5 minutes its says: Unable to connect to the world. Please check your internet
connection and try again. (note: this is not a server or a friend that i am trying to join. This is my own single player world on minecraft bedrock windows 10 pc version)

Also: i removed all my resources and behaviours on my world. and the loading is still long and still says unable to connect. I think because the world is over 260 or 280 MB it wont connect me on my world.

I advise to check my 44 second "cant open world.mp4"video for better understanding.
I hope for a fast respond beause i really build much on this world and i cant even play on it anymore.