Nicola Rampazzo

I've been experiencing this bug too on Xbox One on first Bedrock releases.
Never happened when playing on 1.2.8, happened again today after 1.2.9 update.

@auldrick I tried 1.2.5 because of map conversion bug, found GPS dropping near my base and farm. Need to test direct correlation with wheat crops near farm...

I believe it affects also 1.2.5

Maybe it's duplicate of MCPE-28028 will try the wheat trick described in the comments

I updated on Xbox yesterday to 1.2.5 for testing out MCPE-25354: right after spawning FPS were ok, I started wandering around to check map generation, than after a few minutes (don't know if mob-spawing related) frame-rate dropped to 6 FPS... tried close/open, restart game, change video settings... no help, always stuck on 6~10 FPS

I tried yesterday on 1.2.5 (.12 I believe) ... didn't have time to fully explore world for missing chunks, but at least "home" map seems ok.

Tried twice today to upload old xbox world. Upload process gets interrupted without notice and game exits.
Restarted console between attempts.

Faced issue converting world from XB1E save. Tried again today after 1.2.1 update but same result. More info on issue: original save file is 258MB converted is 164mb.