When I use custom factions with the trait “Overgrown Citys”, When I finished the symbiosis of the enemy city in the game, I can see some building buttons, but there's no feedback on clicking anyway.
 I can’t build the extractor (and Watchtower) so I can’t get the resourse.

Extractors built before cities are symbiotic will become Mikara versions after symbiosis. 

I think it's interesting.(Maybe it's not a bug.)

Thanks for the report. We'll take a look into this. :)

Thank you for your report. I've passed your info along to the team, as some of this seems unintended.