Plugin blocks Mappings that include double quote character (")

[reckoner]

Plugin blocks Mappings that include double quote character (")

[junegunn]

I don't understand why they don't work. They should still work though you may find pointless flashing of the peekaboo window annoying. It's possible that the other key bindings in your config are getting in the way.

Having said that, it is strongly recommended and considered to be a good practice that you always use noremaps instead of maps unless you explicitly want recursive expansion of the keys.

nnoremap <M-o> "+gP
inoremap <M-o> <ESC>"+gP

With noremaps, " is not expanded, so peekaboo will not be invoked.