Problem:
Using "Clipping Reference" in a corridor disables the possibility to correctly annotate points in a cross section view. The problem is with annotating the cross section that the point names are displayed as "None" for the clipped corridor in the bottom frame.
Solution:
Please, check Text Favorite assigned to your Annotation Group. Changing your Text Favorite from "Point > Name" to "XSection > String place holder" may solve this issue.