Old maps have lost their numbers; they're now just "Map" (minecraft:filled_map, scaling at 1:1, level 0/4), and display the same geography.
MC-122314
All maps created in earlier versions are now the same
Resolved
Fixed
5
I believe this is two separate issues.
1. Map number not appearing when advanced tooltips are shown
2. Maps not having an upgrade path from
Damage->mapI can confirm the first issue, will try to confirm the second shortly.