The bug
This happened twice to me today.
After leaving a nether portal to a swamp, the swamp colors seem to be incorrect on some blocks. They change to the correct color after a block has been updated.
This issue also happened to @unknown, but with the ocean biome colors; see MC-174157. With "Biome blend" set to default, my issue looks very similar to it.
Video
Started recording after having left the portal:
[media]Linked issues
is duplicated by 10
MC-174157
Biome colors along chunk borders sometimes render incorrectly after teleporting to new chunks
Resolved
MC-183991
Chunk sized lighting glitch with floating nether portal over water
Resolved
MC-187359
Ghost biome ring appears when loading a world
Resolved
MC-190523
Grass texture wrong on biome boundary
Resolved
MC-194610
Water in custom biomes, can sometimes appear with the wrong color
Resolved
5 more links
relates to 1
Attachments
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5 more comments
[Mod] violine1101
This might be related to MC-166123