Assume that person was raised and baptized in a protestant tradition and later decided to convert to Catholicism. The person could not remember the words used for baptism so it was unknown if the person received the actual sacrament of baptism, so the priest and the person to be confirmed into the Church decided that it was “most likely” that the correct form of baptism was used, so there was no Catholic baptism or even a conditional baptism.
Then suppose that years later, it was discovered that the form of baptism was not valid or that there was a chance that it wasn’t valid. What is the best course of action from there? I would assume baptism, or conditional baptism. Would this type of thing need to be done immediately?
Also, does that invalidate every other sacrament that the person has received? Confirmation, Confession, etc?