My Problem :
I update a few days ago, from the stable version to the lastest experimental version.
Before that, i start a new clear world 2 weeks ago.
Sometimes, i have a few turrets, that i cant desctruct.
Not with bots, not by myself.
See this pictures:

I have 10-20 of those turrets on the map, that "Cannot be mined"
I use no Mods, only 1 mod installed, "Helicoper"
Save file attached.
Here Marks on the Map, where the Turrets are, which i cant deconstruct.

I attached a save file.
Thank you.
Maybe another player have the same problem.
Greetings