In case you did not know, the Pathfinder2e system was not yet updated to work with V11 of Foundry. Luckily, this has been updated, and as of 5 days ago v5 of the system was launched and should work properly.
As usual, remember to follow best practice, and back everything up before upgrading anything, whether FoundryVTT or even just the game system.
Pf2e system reference
FoundryVTT V11 update page with backup guide
Have fun, stay safe,
~ Scevola
Is there a pf2e community here on lemmy?