It could be a vanilla bug, but since I use this mod, I thought it useful to report it here.

I used a fully upgraded Name Planet card on a level 2 planet with a level 2 resource, bringing its maximum population from 8 to 13... however, its income remained the same (500k) regardless of the additional population (it did not change whenever the population was above 8).

Is it expected? It is odd and I couldn't find any post about this behavior, either here or anywhere else on the net.