Dogmatic ѕυιcιdє is denying ex cathedra decrees.
Dogmatic ѕυιcιdє is twisting
ex cathedra decrees around to support your hobbyhorse.
A pope does not say in a canonization "You have to accept this or that doctrine that is contained in a work attributed to this or that saint", but most people want to look at it that way, as though a canonization means the saint himself was never capable of erring, falling into heresy at one point or another, or even being non-Catholic.
THAT is true, except for the last part about being non-Catholic. The Church could never canonize a saint who was non-Catholic. If he had made an error that temporarily took him out of the Church, he would at some point have recanted and been restituted. How could someone who dies a non-Catholic be canonized?
You see, where the soul of an unbaptized catechumen goes after death, despite what Feeneyites tell you, was never a matter for heresy. It was an opinion. The Church never told you that you MUST believe all unbaptized catechumens go to hell. Never, despite their use of chop-logic to make it appear so.
Now it is a dogma that unbaptized catechumens MAY be saved. Not will, but may -- that is why they are buried in consecrated ground. And the Feeneyites are denying this dogma.