Amidst has yet to be updated to map the village locations possible with the loosened village placement parameters of PCMC1.10.
That village is on a border of two biomes so, currently, wouldn't show on an Amidst map.
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There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
If you aren't part of the solution, then you obviously weren't properly dissolved.
That's a rather odd village; it appears that it generated in the strip of desert that generated around mesa but instead of being based on desert-themed blocks it used the default (plains) blocks since the well is located in extreme hills.
Recently, while testing a mod I found a similar village in a desert and determined that this happens because the point the game initially checks to see if a village can generate, which must be in one of their valid biomes, is not the same as the point the game checks to determine the type of village, so the biomes can differ (my mod is based on 1.6.4, where villages had to be entirely within one of their valid biomes and I have not changed this, but the point the game checked to determine the type was in a river just to the south of the well, so it can even happen in older versions, just less likely due to the biome restrictions); when I made it so that both points were both the same the village was desert-themed as it was supposed to be (in your case I suppose it makes more sense for it to be non-desert since most of it is outside of the desert).