The right click on my pen tablet doesn't work.

This often happens when I use the material tab.
It's the part circled in light blue in the image.
(*Right click is disabled when using an object, so it's fine at that time, but for some reason it doesn't work when I'm using the pen normally either. I've confirmed that the pen's right click modifier key is set to the same setting.)
I thought it might be a problem with the pen, but it works fine on web pages, etc.,
so I think it's a problem with Clip Studio Paint.

Clicking is set as in the image.
Middle clicking works fine.

I wonder if it's some kind of glitch or a problem with the settings.