James Fortner

The same thing happens on my realm.  I can play on xbox fine, but if I log in on Switch my character loses all xp levels and inventory including ender chest.  I replaced my realm world with a backup from 3 days earlier and it was fine.  Logged in on xbox and everything was restored.  As an experiment, I logged in on Switch again and again was reset to 0 inventories and xp.  Reverted back on xbox and xbox was fine again.

Well I found that the maps overlap. I made a map and fully explored it. Went into the next area above and opened a new map. Zoomed it the same as the other one (3/4 version). It worked fine. Moved to a new area, did the same - opened a new map and expanded it to 3/4 version. This one overlapped the original map area by like two-thirds of the map being useless.