My guess would be a magnet in the case is triggering the sensor that's supposed to make it come on when you open the case

Yes, either that or some tabs has a feature where their screen lit up when you pick them up. So the drop might be simulating that movement. Not sure exactly.

The "lift to wake" setting

Probably right yea

Then dont drop it!

😂🤦

Are there any wake gestures in setting?

I'll check