The older bugs may be related to XBOX sync but they are fully different bugs and this started almost in 1.21.120ish and I somehow got a way to fix it at least for myself and also the title to “the duplicate” is failed to sync MC worlds due to lack of save data space (2 GB more for sync is death of sync) this is completely different here the syncing deletes the worlds the syncing is the problem not the fix and I see that the 2 bugs together cause deletion but if one is fixed it makes a better way for a fix and that's deleting worlds that you don’t play so it goes under 2 GB limit but this bug needs to be fixed for the other fix to work that is more useful I just wanted to post and see Mojang fix it I had to pay 3.99 for a 100% safe backup on my PC and I am really sad that this post by Mojang isn't getting any fixes I can't literally play Minecraft on my Series S if I want to I need to know that I fully skip syncing and don't miss one cancel button also then I have to quit Minecraft so quick resume doesn't start syncing this is really hard to bypass I don't know how the Mojang testing team haven’t noticed this yet like XBOX is for Microsoft and Microsoft owns Minecraft also from a view the chain goes like this Microsoft then XBOX then XBOX Game Studios then Mojang Studios like an XBOX should be the best way to play Minecraft not the baddest way after Nintendo Switch Lite. The reason I responded later was because I needed to think about a good comment that is gonna help this report
if you have concerns please comment and i will surely look at it.