My Character does not mantain the revealed parts returning from vertex paint

Hi all, is my first post here.

I don't know if is the right place to receive help, for Blender files here.
I try :-)

I have a problem with my human mesh.

I hidden the half rear part of Alba and now when I return from Wheight Paint to Edit mode
the hidden part remain/return alwais hidden evein if I reveal it and save/close/reopen my file.

Somebody can help me to resolve this issue?


Many thanks!

E-