[oldE]

I had a similar situation a few years ago when paper wasps were emerging in our sunroom frequently. I discovered a check in the siding which led to a tiny gap under a window. The space between two studs had been completely filled with the nest and mousture had got in and rotted the structure under the window. That was fun. A full can of Raid early one morning made the area safe to work in while I rebuilt that section of wall.
Pot lights are an invention of the devil. They invariably had holes to promote ventilation so heat would not build up. That lead to air leaks. There are plastic domes you can install over them to address the issue, but now led bulbs don't make enough heat tocause a problem. I would just use caulk to close any holes in the pot . That should block the path of any bugs.