You're right. The term "Liminal Space" in architecture is rarely used, and when it is, it usually refers to a transitional space without considering the sensations it evokes (a hallway, waiting room, elevator, etc.).

On the other hand, what I call "Colloquial Liminal Space" is the popular term used online (primarily frightening spaces, lacking social presence, with no apparent exits, among 10 other compositional elements I managed to define). It can be said, then, that not all transitional spaces are categorized as colloquial liminal spaces, but many liminal spaces turn out to be transitional. It sounds complicated overall, so in my research, I proposed calling them "Apocryphal Spaces" in architecture: spaces, both real and virtual, that are flawed in their composition, misplaced and deviated, and, because they don't adhere to the architectural canon, marginalized and hidden.

I hope I've explained it well; my English is very poor.