Reporting Minecraft 1.17.11 Bedrock with Beta (latest)

Problem: Map tipe: Experiment

More info: Transfer Experiment Map in 1.17.11 to 1.17.30 

itemi inside Chest Gone 

Chest Include : Yellow Chest, Brown Chest, Shullker, 

Item contai: everything, include resource, stone, block

Note BUT:

all item in Enderchest have not problem, nothing happen

 Non Experiment Map have not Problem