Fix ASan error, suppress more checks

[Venera3]

Summary

None

Purpose of change

#72879 failed to solve the whole problem and included a sloppy ASan error.
Hopefully fix that.

Describe the solution

Same basic logic as the previous PR, with an added caveat that basegame traits still trip the error.

Describe alternatives you've considered

Testing

Same test trait , trips an onload error when from the same source as its out-of-category prereq, doesn't complain for a basegame prereq mismatch.
I'll need to check if it actually solves the bloody ravenfolk stuff on the feathered arms, hence the draft.

Additional context

Not flagging the PR as ready to merge before reading all the unit tests might be a good idea. We'll see if I learn.

[Venera3]

No load errors in the AFS/Magiclysm/MoM/Limbs catastrophe save, should be good.