lonelymelon07

I recently joined my friend's survival world on minehut, I was making perfectly normal progress and I had found 14 diamonds. Later, I died while carrying my 14 diamonds, and I was able to retrieve my stuff. Then I logged off. When logging on today, I find my entire inventory wiped clean, even after relogging and relaunching the game, including my 14 diamonds. The only thing that I can think that caused this was that I changed my username between logging off and logging back on. Would this be the cause of the issue? And if so, is there any way to fix this? It seems like a pretty poorly designed system if it can't handle a name change, especially when UUIDs exist