Question Flip to Shh not working?

[groston]

IMO, the setting ‘Flip to Shh’ is one of the most important settings on a phone and it worked exactly as expected on my old Pixel 3. However, on my new OnePlus 12, I have set the setting ‘Slip to mute incoming calls’; but today, for the second time, a spam call came in while the phone was flipped, yet it rang. What the BLEEP is going on???