greenbaggins
Puritan Board Doctor
It would not have been addressed directly in the Westminster Standards because it was not an issue. The Reformed position at the time very clearly was to accept RCC baptism and the men at the assembly would have argued for it against the separatist position which was to unchurch their churches because they accepted it.
I would not unchurch any Reformed church that accepted RCC baptisms. What I might do, however, is baptize any people transferring from such a church that had not been baptized in the PCA church, but rather had had their RCC "baptism" accepted. That would not be unchurching the PCA church.