Weird issue with right click in Photoshop on Windows 11 PC

Now when I try to paint in Photoshop with the new Huion tablet, the right click does not work properly. Every time I right click to bring up the brush menu, it flickers to the point of being unusable. I can't paint like this, I need this brush menu. See video. What's going on here and what could I try to fix it?

OS is Windows 11.

• old Wacom driver is uninstalled
• Latest Huion driver is installed
• On windows "Pen and Windows Ink" config section, I disabled "Let me use my pen as mouse in some desktop apps"
• in the Huion driver app, Windows Ink is deactivated