Thank you very much, Muche

Disabled that mod and instantly fixed.

Many thanks once again kind sir.

I can't say specifically when those turrets in the image were destroyed but I can see in real time as biters are destroying buildings that there is no ghost appearing to timeout.

The ghost to order the construction robots to rebuild is not appearing after a building is destroyed.

I have researched Construction Robots.

In the attached image you can see Laser turrets that have been destroyed by biters but not replaced by robots due to missing ghost

It is the same for walls ...