Missing pagans in your town
It looks like EA recycled the code from the Halloween event. If you can't find pagans to tap, they are probably just standing there under your house farm, because they spawned there, and they don't have room to move. The stupid beasts from Halloween behaved the same way. At least the beasts had some purple highlights to stand out when you apply the buildings filter, but the pagans are so tiny, it's like looking for a needle in a haystack.