updated the game it worked ty
I have been experiencing the same issue for the past 7 or so days. A few days ago it switched from crashing after a minute to just not loading the world the crashing. I reported this issue on Reddit and someone else said they were having the same issue. My world is 75MB but worlds that are less than that are still loading. I would hope this would be fixed because I spent 2 years on my world as well.
still 2 years later and it still hasn't been fixed. for this reason I've been using banners less and less in my builds