When modifying socket names in a static mesh, some names are forced to first letter capitalization, some are not, and some are forced to allcaps. The behavior is consistent in the sense that certain words seem to always get certain rules applied. The string “wall” gets changed to “Wall”. “window” gets changed to allcaps “WINDOW”, for instance.
I’ll test this in a new project to see if I can repro. Sneaking suspicion it might be user error, and there’s some really non-obvious but logical reason for this, but I’ve got no idea. It sure is an odd one.