Drones come from this mod by Klonan: https://mods.factorio.com/mod/Construction_Drones

They can (and happily will) build a tower (of any tier) after a ghost is made, especially if no other bots are in use. But then the tower doesn't rotate (no animation), doesn't pick anything up and in general shows no signs of life.

script_raised_built event probably has to be handled to hook all the cases of entity construction, but it isn't.

The bug can be seen on video here (not mine): https://youtu.be/fEKKcv6RMcM?list=PLnIE0W-m629dg0TU69YK8XF8Z6EoBHFFs&t=29

Thanks for reporting, just reproduced the problem. (I am not using that that Drone mod so unaware of that.)
Recent update 0.17.6 should be fixing that. Please let me know if it works for you or not.
(Thought I had also handled that when adding the script-based destroy, but it was NOT...)

PS: Thanks for the video BTW. Somehow it is interesting for me to see how players play with my mods, whether good things that they like, or bad things that need to improve. For example, I am happy to see that the evolution info panels (from Schall Endgame Evolution) was useful to JD in managing and predicting when next tier of aliens will come. I also found that he was inspecting the alien ore recipes (from Schall Alien Ore) morphing ratios back and forth... So now I know I can add some recipe descriptions for save players' time a bit in maths.

Yes, now it works.