Maps don't work correctly anymore after enabling the Caves & Cliffs preview data pack, in chunks that were generated without the data pack.
To reproduce
Create a singleplayer world in latest release 1.16.5 in creative mode.
Give yourself two empty maps and use them.
Lock one of the maps using a cartography table and a glass pane
Save the world
Add the Caves and Cliffs preview data pack to the world
Open the world in the latest 1.17 snapshot
→ ❌ The unlocked map will look stone-likeCreate a new map in newly generated chunks
→ ✔ The map looks correct
Screenshots
[media][media]Notes
The altered map seems to fill data from lower chunks of the overworld.
It is possible to see lava flowing at such lower levels.
Reason of this bug could be how map drawing code handles fields
logical_height
,height
,min_y
,has_ceiling
insidedimension_type/overworld
.
Linked issues
is duplicated by 1
Attachments
Comments 3
More info
Both attached screenshot have been taken from 1.17-pre4
The first screenshot is the map locked in 1.16.5. It is not a new map generated in 1.17-pre4
A map generated in snapshot 1.17 can render partially fine and stone-like depending whether the rendered chunks have been generated with or without datapack.
I'm not able to reproduce with the steps provided. Did you forget a step?
Edit: Ah, right, forgot to add the data pack. Can confirm.