I tested this using an edited map and can confirm that it isn't just room2C. Tests show that the following rooms are not handled properly. Examination of the saved map in a hex editor both before and after testing in-game indicates that the editor is saving the correct room names; the problem is with the game itself.
room2C
Produces a lockroom. Wiki
says it should be
a corner room with a fake door located in the Containment Zone; rooms.ini confirms this.
room2Cz3
Produces a lockroom. Wiki
says it should be a corner room in the Office Zone; rooms.ini confirms this.
room2Ctunnel
Produces a corner room with a fake door located in the Containment Zone. Wiki
says it should be a corner variant of the
cylindrical hallways. Rooms.ini says it's a Heavy Containment Zone room (contradicting the wiki).
I can upload the test map if needed, but it literally only consists of a bunch of supposed-to-be-corner rooms and the occasional 3-way hallway to link them.
EDIT: Testing shows this still happens in v0.8.