Autofill doesn't work with (locked notes) in Apple Notes

Same happens for me when trying to login to steam in the steam app, so I add this issue here (if preferred, I can of course create a new thread ?):

shift - command - spacebar bring up Quick Access. Searching for the Password item, and selecting Autofill: nothing happens. command-c resp. command-shift-c and command-v works, but autofill does not fill in anything.