When updating to 1.15.2, if you've loaded an area in a previous version, the exact block to block location of biomes changes. The attached images (1.14, 1.15) are of the change in effect. I re-created the world this happened on in 1.14.4 and updated to 1.15.2 to verify and take screenshots. To more clearly see the effect, I created a flat area of grass above the Mushroom Fields biome, turned off biome blend and placed a fence along the edge in 1.14.
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Duplicate of MC-160939. This has been resolved as working as intended.
This comment is to elaborate on the issue from my POV, but is not critical for the description of the issue.
This severely impacts my base area as I now have to re-outline the area, dig up some grass and place others, and hope and pray that it doesn't overlap with any existing builds I've done. Rolling back is not a viable option as this is a server and this issue isn't game-breaking. It's just an extreme annoyance/inconvenience and raises a HUGE concern that something like this may happen again in the future.