MC-129500Map displays 1 deep water as dry land.
In game map shows one deep water as dry land.
Possibly related, tall seagrass in 2 deep water (so it touches the surface) also shows as dry land.
Linked Issues
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Created Issue:
Map displays 1 deep water as dry land.
In game map shows one deep water as dry land.
Possibly related, tall seagrass in 2 deep water (so it touches the surface) also shows as dry land.
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2018-05-12_12.36.21.png
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![[Mod] tryashtar](../../../data/avatars/users/41963.png){kind=small}
is duplicated by
![[Mojang] Cory Scheviak](../../../data/avatars/users/92893.png){kind=small}
[Mojang] Cory Scheviak![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
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The cause for this is that while drawing the map, some of the top layers are skipped for some reason. When destroying and placing a block on the surface, it appears on the map correctly. There probably is some limit in the code that draws the map.
(See also MC-129500 for examples where the background is not completely gray.)
AH and I think I have found the cause of this bug
The recent world format change modified something relating to height maps for lighting calculations. The maps appear to use the value taken from here, but the world generated before 18w20 does not have those tables properly generated by the updating code (and, presumably, they default to 65).
I don't think this is related to MC-129500, at least not directly. That one could be just an off-by-one error.
Here is an experiment confirming my theory: everything gets back to normal after placing a torch in the chunk, forcing an update of the light/height map.
Can confirm for Minecraft 18w19b
Caused by
MC-129870?MC-129870seems like a duplicate to me.Yes, resolved as such.