'Splain it. The Church was in error.
Okay; the local Inquisitional court in Northern France found her guilty of heresy in 1431. Appeals were immediately made to the Holy See, which then opened its own investigation. 24 years later, the finding was annulled, officially.
Has any "Saint" ever been stricken from the roll of Saints?
A handful, sure.
The "Church" was in error. Maybe you prayed to that "mistaken" Saint. Do you feel like you've been had?
No and no.
That is drivel. The "men" of your Church have no business declaring Sainthood for any person. God does not err, men do.
The whole business is an attempt at recognition, not a conferring of salvation.
Is it a recognition of salvation? Do you imagine the Church would recognize a Saint who is not saved and is destined for Hell?