afaik it’s standard practice for b”d to keep tabs for a while after the gerus. It can become an issue if they did not have proper intent when they went to Mikva.
If there was proper kabbolas ol malchus shomayim and kabbolas ol mitzvos at the time of Mikvah then it isn’t so simple.
Rabbi Goren in the Langer case
Cute, I don’t think you can make a general inference from that case