The documentation says this:

; It's also possible to combine keys and expressions.
@char Miho.Uniform,Hair/Front>Short

This in fact does not work, and returns a warning stating that the prior expression (Uniform) was unrecognized.

Hi, Please contact the support via discord (https://naninovel.com/support/#naninovel-support) and provide the steps to reproduce the issue.

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaand turns out I wasn't on the latest version..............

Apologies!