The colour used by water seems to much more closely resemble the default water colour from 1.12.2 and prior, rather than the updated 1.13 palette (and even in 1.12.2 and prior, would not respect swamp tinting). Expected behaviour would be that it would change on maps to respect its actual appearence, but it does not.
Bedrock Edition is unaffected by this bug. For example, here's a visible divide between two different ocean biomes:
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Linked issues
relates to 10
MC-201333
Dark prismarine, stairs or slab and prismarine, stairs or slab have wrong color on maps
Open
MC-201332
Normal shulker box and purple shulker box have wrong color on maps
Open
MC-174861
Waterlogged blocks are not accounted for when calculating water depth for map rendering purposes
Open
MC-201152
Melon and pumpkin stems appear green on maps regardless of growth stage
Open
MC-165776
Wood has different color than rotated log on map
Open
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Comments 13
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Hi there!
I can confirm. Clones MC-151932, so may be seen as a feature request.