I have an issue with only a part of my mesh hiding the vertices, even though it will still show the faces and the complete mesh.
It will look like this until I press Alt + H to unhide the hidden verts of the coat. The sleeves are always visible, and the coat isn't for some odd reason.
After unhiding them, I proceed to go into weight painting mode and that works fine. Until I try to mask a part of the mesh and then the issue with the vertices occurs. They go back to being hidden, like I never unhid them.
Only the sleeves can be weight painted while in the masking mode.
I have zero clue as to why this keeps happening.
The coat was originally a cloth simulation and converted to mesh after the simulation got to a point I liked.