i lost mine too! and now im so sad because that was my favorite cape and its now gone and im soo late on this but that is because i put off learning how to use sita Anyways yes i used to have it but its gone (did you get it bacif so thanks that gives a little more hope)
Also that cape was the only cape i got ecept the PAN cape
He probably means your chests in Minecraft crashes/corrupts every chest in my survival world becomes replaced with a empty chest like if you used setblock command 2 times it would place chests and disconnected the chests (large chests and shulker boxes) if you leave the chunk or log out and back in so everything you had would disappear
for me it hasnt been fixed at all scence like 1.14-1.16 i know its one of those and before i could go up to 22 chunks but then i could only go to 16 and as of righr now i can only go up to 14 chunks