Not sure if this is a known bug, but I have my resilient settlers ability trigger (for Moltar) even when I have the proper colonization tech for the planet colonized.
At the moment it will trigger the ability even if you have the colonization tech. There is no option not to use it. Resillient Settlers confers the additional bonus of no morale penalty from environment for a few turns. I suppose we could let the player opt to use it or not. What do you think?
I'd recommend giving the player the option, but mention somewhere in the description that there is no morale penalty from environment for X number of turns.