Can confirm this is happening to me too. At first it was just worlds I transferred from Xbox One Edition, but now even worlds I make ON BEDROCK will not sync after I save, exit and come back later.
Mojang I don't know what's been going on but you need to fix this issue yesterday.
I'm on Xbox and having a similar issue. My converted superflat worlds seem to corrupt after I save and exit and I can't re-enter them afterwards.
This has been a problem since 1.19.3 my question is: Why is this taking so long to fix? And why does this problem seem to be exclusive to Bedrock?
I've made some custom music packs and I'd like them to actually work as intended. Mojang guys, c'mon it's not like we're asking for custom superflats, we just want the timer restriction on music discs removed.
So what you're saying is pulling in blanks is a mechanic and not a bug?
I've been able to use custom music disc packs, but not my custom texture pack, however I DID lose all my previous 3 worlds.
Ok well, if that's how you feel, then I guess I'll uninstall the game. If it wasn't supported then WHY did it work near perfectly yesterday and not at all today?! I spent hours of my life on these packs, time I will NOT get back and you can't even be bothered to look into this?! How about other content creators hmm?! Y'know ones that make actual mods for the marketplace?! Oh that's right you only care if you can monetize them, this issue is far from invalid, in fact I'd argue this issue is major as Minecraft mod support is KEY to its survival as a game. Sure vanilla MC has done a fair job on its own, but without mods, the game would've died years ago.
Ok so bad news. The 1.19.31 update has my Xbox completely unable to read or even have my custom packs show up. I have multiple mods in my behavior pack folder but in-game on 1.19.31 it says I don't have any packs installed. Has the way packs work changed at all? Because yesterday I had every single one of my packs running just fine.
I've actually figured out the problem, a lot of the textures were over 1000 by 1000 pixels, I've since reduced the size and the issues has resolved itself, although I would say include file size limitations in some kind of readme file for the official vanilla add-on templates, just so people won't make the same mistake I did. This could be considered resolved.