Plains villages generating in the wrong biomes superflat

The bug

Plains villages generate in superflat worlds biomes where they are not supposed to generate (e.g. the_void). These villages cannot be found using /locate village.
Below are 3 screenshots of the villages and the biomes listed in the debug screen.

In biomes where villages normally generate, the correct biome specific village is generated (e.g. desert or savanna). So I think the problem is that every biome where villages aren't supposed to generate get plains villages, but the ones where villages generate naturally are unaffected. 

Example worlds

Last tested in 20w51a

63486455778136911

minecraft:sandstone;minecraft:the_void;

/execute in minecraft:overworld run tp @s 61.74 1.00 -119.51 -158.25 -2.55