ok so i think i figured out a way to fix the crash problem. If your tablet or ipad as and sd card slot, put an sd card in it and then export the game to the external storage, then try and open the game. if it works and the game loads then the problem is solved, i just tried this and i kept closing and reopening my minecraft pe and it keeps loading up and it still loads even after i have downloaded my world packs and skin packs from the marketplace. also i did this for about 30 minutes and its still working. please try this and i hope it works for you as well
If you updated your game then thats all you updated. Your issue may be with an outdated addon. Installing a newer version of your addon wont fix the issue because it cant overwrite whats already in your game folders and uninstalling and reinstalling wont remove addons in your game folders. you have to manually deleat the folders then restart your device then reinstall you desired updated addons for what ever MC version you are running after updating. I play around with various Beta versions of MC and when I get a crash to desktop it always follows testing a new addon that hasn't been updated to my MC version. I am currently running 18.104.22.168 on android and some of my addons are listed 1.13 but seem to still be 1.12 or lower and tend to be incompatable and need to be deleated when issues arise some don't. So try deleating your device games folders ( dev/games/com.majang/resource_packs and dev/games/com.majang/behavior_packs) you plan on reinstalling. Unless you just installed something before the issue started then you can try just deleating the suspected folders in your resources and behavior folders then clear cashes and data under apps then restart you dev
If you guys had the problem after update or download, and the game has black screen then kick you to app list, i have solutions for ya (your world going to deleted btw) you can use this two tips.
Open app manager, look for your Minecraft PE and clear data, uninstall, and restart your phone after that download back the game.
(Only work for specific phone)
Second solutions is:
Open your Minecraft on PlayStore or ETC. Make sure you get out from Beta tester, uninstall the game, if u already uninstall the game make sure ur not Beta tester anymore, then download back the game. (This solution works well for me but my 5 yrs old world is gone)