"A picture says more than a thousand turds". Hmkay will take a quick look at village placement/detection for r10.

BO4's are no longer allowed to spawn within a 4 chunk radius of villages/rare buildings/mansions/oceanmonuments etc for v9_r11. Underground structures like mineshafts and strongholds are excluded. If other mods add structures that are larger than vanilla's, may have to configure a different radius per mod.