IMO, moderators of communities need to merge their communities. Identify which community is bigger and quite frankly push users to just use that one, to reduce the ambiguity over which one to use. The software ideally would also have an officially supported way to just close your community and transfer everyone's subscriptions to a different one, so that we don't have these duplicates confusingly still showing up in the listings.
I personally did this. I tried to create and promote a community I thought I was the first to make. When I learned it actually already existed (and just... didn't show up in search because of course not), I shuttered the one I made and pointed it at the other one.
What's bizarre to me is that the Android community even did switch to a different one... and then switched back to having two?? It's weird and I don't understand why they did it.