“If a room contains a Sigil from a Vampire Lord then no Glyph may be created for that Vampire Lord, and vice-versa.”

This seems pretty clear to me: if you have a Sigil, you can’t have a Glyph. Nothing about this rule says it has to be the same room.

As such, I’ve recalculated the Zahndorf Crypt page to show what everyone’s statistics should be, allowing for the fact that the glyphs (apart from Bucky’s, who wasn’t a Vampire Lord and anyway didn’t have a Sigil) were never legally created. Note that as far as I can tell, the Puissance spent on Glyphs is still spent, because you choose the list of features for a room separately from actually adding them (they just fail to be created). Only one action failed because of this: Chiiika’s most recent Distil. (Unlike what I said earlier, Brendan’s Distil+Shatter worked: he had enough influence for them because he gained it from the Stair Muncher, which is a Denizen not a Glyph.)

At 16 Jul 2021 10:56:49 UTC, we upheld all Influence gains from Glyphs via CFJ. Therefore, I haven’t reverted Influence gains from before that time, even if they would have been illegal, due to the CFJ producing the influence even if the Glyphs themselves didn’t exist.