Black screen during a call,

I know the feature that turns off the screen in a call when it’s up to your ear, but I called someone and it went to voicemail and attempted to hang up, the screen wouldn’t come back on. So I thought power cycling it would work. Pressing the volume up and side buttons didn’t work, so I used my iPad to call myself on discord. I heard the incoming call (end and accept/hold decline) but couldn’t touch the screen to do any of that. Tried a second time and it fixed, but this issue should not have started in the first place and I want to know why, or if it’ll be fixed.

specs: 11 pro max, latest firmware, screen dimming on call was on, before the call I turned off show my caller ID, minor things that might be related do not disturb on power saver off.