All builds and chest and everythin in the chest is gone but I still have my inventory

I normally started Minecraft and wanted to start my survival World but then I saw that the MegaBite went down and I wonderd why but I started the world anyways. It loaded normally and I had everything in my Inventory, but everything I ever build and every chest with all the things were gone and I didn‘t know why.

I play on a Ps4 on version 1.16.221 

pls help all my stuff is gone everything in my chest and my house