I had a similar issue in my game. I'd saved my game last time while exploring somewhere far away from my base by car. I'd noticed last time that the construction drones would repair my car only when I got out of it, if it had been damaged by running into a tree.
When I loaded the game today, the drones no longer repaired my car after hitting a tree, not even if I got out of the car. They also didn't deploy to remove trees marked for deconstruction.
Checking timestamps on my installed mods, it looks like I upgraded to the latest Construction Drones version last time, and to the latest Bob's Mods today.
I tried reproing with subsets of mods, but couldn't. Not even with all my mods enabled again. And then I couldn't even repro after loading my game again. The drones are working just fine now in my save.
beggerSo, try saving, quitting and reloading? It shouldn't matter, maybe, but that's what seems to have fixed it for me.
Maybe the migration code that ran last time left things in a strange state? And that somehow got cleared up on a subsequent save?