This was pointed out to me about my mod: https://mods.factorio.com/mod/SearchlightAssault/discussion/61bb67e483ef983636b230ee

It seems like drones from your mod try to attack indestructible targets, but can only chase them fruitlessly.
Meanwhile, other units in the vanilla game always ignore indestructible targets.

I don't know if this is intended or not, but you can consider changing companion.lua:842 to include not entity.destructible to change this behavior.

If there's something I can do on my end / general comments, please let me know. Your mods are the coolest!

subs here, I am topic starter in the Searchlight mod's discussion there

EDIT: tested the patch note locally, and it works - please add it
PS. Klonan thanks for the mod