Game slowdown because of extensive "Tried to get grid on null map fore ..."

[Waldleufer]

Describe the bug

A clear and concise description of what the bug is.

Describe your game setup

1. • I updated the experimental Version of TiberiumRim and moved my colony to a new place to get rid of errors occurring because of the new Tiberium Things.
2. • Running other Mods besides TiberimRim, HugsLib and Harmony
3. Playing with the following DLCs enabled
   • Rimworld - Royalty
   • Rimworld - Ideology

To Reproduce

Play TR for some time. I have some suspicions that these errors might be related to the Mod Hospitality or to Trading Caravans, since the names listed here are not my colonists. It definitely happens that some get Tiberium infections and then leave the map while being infected.

HugsLib Errorlog

https://gist.github.com/350624d65946394d6e4288f31d6077e9

Expected behavior

• [ ] No game slowdown should occur.
• [ ] If a pawn is not on the map (Pawn from a trading caravan or Colonist that left and joined a different Faction, or Visitor that left) And that pawn is about to enter Tiberium mutation, the mutation should be handled in a way, so it also works off-map.

Actual behavior

Pretty strong game slowdown. At first barely noticeable, but getting stronger and stronger. Probably related to the amount of pawns that are infected and not on the map increases over time.

Screenshots

[Waldleufer]

They re-entered my map!

And that made the error go away!

So it might occur if a pawn enters a mutation state but is not on any map.

HugsLib Errorlog after them entering

https://gist.github.com/c819ea78438b04c52bfe9fe46d6e8c88