1. Go to settings
2. Click on about device
3. Click on Software Info
4. Keep clicking on Buikd Number until Developer Mode is turned on (don't mess with any settings in this mode unless you know what you are doing)
5. Go back to settings and click on Developer Mode or on some phones Developer Options
6. Click on Stimulate display with cut out and change to tall cut out and change back to default
If you don't see simulate display try playing around with other display settings in developer mode but make sure you do it one at a time so you know how to reverse it if it doesn't solve your problem.
This fixed the issue in 10 seconds and hope it solves all your issues too. It's quite sad to see so many people going through so much trouble due to this issue.
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