That’s just not true. The Church is explicit that the children of a union that ended in divorce and annulment are legitimate. This is because the Church presumes the couple intended to marry in good faith, and therefore, are not guilty of the sin of fornication, even though there was no true marriage at all.
“This is because the Church presumes the couple intended to marry in good faith”
If indeed the Church presumed such a thing, the annulment wouldn’t be granted... The annulment is because they (supposedly) DID NOT marry in good faith.
The Church is dancing around the problem...