The Show/Hide Plugins (Windows | Key Commands) doesn’t seem to work in Cubase 12 with Midi Remote Mapping (it worked with Generic Remote in Cubase 11)
I’m running into this too, except specifically trying to replace my old mappings. VST Mixer/Selected/Ins. 1 Edit for example has no equivalent in the new midi remote
Yeah - I’ve reverted to using the Generic Remote for pretty much anything Inserts related.