1) It suggests "O meu";
Diz is according to European Portuguese rules. Anyway, this is more of a style rule than a grammar rule, so you can ignore it if you prefer.
To suggest replacing "pás" with "paz".
A new rule has been added to handle the word confusion.
It has very few trigger words, so you may wish to add a few more, if you find more useful examples.
2) It says "pás" is informal language.
Is 2) a false positive or can it somehow be improved not to be triggered in a sentence such as the above?
Due to the priority system, the word will not be tagged as informal when misused, but a special rule for "pá" has been added as well. This is the first false positive I see with it, but it should reduce them even further.