Hello everyone,
I noticed a bug where, when you upgrade your drone planetary defense, the second tier of the upgrade isn't taken into account.
First tier let drone bases have 3 drones per base and second tier, 4 drones per base. Unless I read something wrong (I don't play Advent a lot so I don't know they research by heart), second tier doesn't give 4 drones per bases.
edit: well apparently I read wrong, sorry !