I have this old world i created back in Pocket Edition Alpha 0.10.5 i think and i hadn't loaded it since April 1th 2018. When i tried to open it in 1.16.0 it crashed the game while loading, both on iOS and on Windows 10. Then i tried deleting the world_resource_packs.json file attached below and when i tried loading it, it suddenly worked. However there are still issues with this world, but i will report them in a seperate ticket.