Chunk was originally a Taiga Hills biome but changed seemingly spontaneously to a River biome. I don't remember doing anything with to the world file or anything else, just noticed it while I was playing, so I have no idea how to recreate it. I created the world in I think 1.14.1.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-150202, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. Depending on the resolution, that can mean that it either will be fixed in the next version, or that it is not considered a bug and won't be fixed.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.