Just to reply to this. I’ve been having the same issue and it’s been driving me crazy. None of these solutions worked for me however.
That being said it suddenly just kind of worked for me but in a very strange way.
Essentially if I play in an editor window straight away only P1 seems to work. If I tab out and back in however it just works!
I need to do some more testing to check if this fixes things for my game but it’s at least highlighted that this is simply an editor bug, not a problem with my code.
Wish I’d known that a week ago.
I did a quick screencap showing my issue.