Not enough empty roboport slots

[jrlester70]

Factorio: 2.0.72 (plus space age)
Factorissimo: 3.11.1

Describe the bug
I cleared a load of stuff from inside a factory using the destruction planner, and some of it went into the roboport hub. Now I get a constant flashing light which says "Not enough empty roboport slots...". If I deconstruct the factory and then replace it, I check the roboport and there's about 12 things in there. I can remove them, and then when I delete and replace it they're back (i.e. I get free stuff).

To Reproduce
Steps to reproduce the behavior from a new save:

1. Start a new save with Factorissimo 3 installed.
2. Run command /cheat
3. Click on '....'
4. Scroll down to '....'
5. See error

• I don't see this after typing /cheat