This has been happening to a bunch of players. There have been multiple threads created on this topic, and I think Cubecraft is working on it. I would report it in the
Bedrock Bug Report support forum. You might get more help there.
Other players who have had this problem:
I have lost my full inventory and my xp in skyblock
www.cubecraft.net
I lost all my items and my xp when the server restarted
www.cubecraft.net
hello everyone ive been in and out of my world going from nether to overworld try to complete quests I had a good amount of my loot on me and my game bugged and when I loaded my game back my inventory was wiped ? can someone fix this or is there...
www.cubecraft.net
And more but I can't find them.