Now you’ve got me interested. I’m betting that it’s one of those rules which exceptions and general contempt have so weakened through desuetude that no one thinks about it (except me) anymore. My one copy of the canons is out of date, darn it, or I’d go check it out.
I think I do remember that when SS Pete’s opened by us, someone came to the house to get us to join there but my Mom told them we were Polish and that was that.
My parish St. Adalbert’s and the other parish in Berea, OH, St. Mary’s were both ethic parishes with long histories. Berea had quarries that attracted the Poles and Irish. When I was in 6th grade, we celebrated 100 years of our parish.
So maybe it’s an ethnic thing.