As stated in title.
Tested by removing Mining Drones and reloading the game, at which point the construction drones resume working as expected. Following this, I reenabled mining drones, once again breaking construction drones.
Mod List:
Construction Drones 0.4.9
FNEI 0.3.0
Krastorio 2 0.9.9
Max Rate Calculator 3.2.32
Mining Drones 0.3.19
I can provide a copy of the savegame if necessary.
All the best
