I believe there is a bug in this particular manifest: https://rocketcal.cc/5497a8fa235e476f17721f86989c1dc4

Particularly, launch #32 comes up to 960kg when loaded (light by 40 kg). The planner says 1000kg launch weight.
The manifest also does not include 2x rare gun turrets in the manual launches ...

What did you do:
Build some ghost objects in the world (belts, assemblers etc).
Enter map view
Try to delete them by right clicking.

What happened:
The first ghost to be deleted acts like a 'real' object (shows a deconstruction bar, and takes time)
The remaining are instantly deleted like ...