Black bar when opening recent apps

[Android10isbroken]

there's a black bar that shows up at the top of my screen when doing certain things. it only started after the beta 3 update. Has anyone found out how to fix it?

[SamsungUSABetaTeam]

Please try clearing the system cache and rebooting your device.

If issue persists, please send us an error report with screenshots from One UI Beta App (Beta Feedback -> Send feedback-> Error Reports -> "Select Category" -> Input frequency and Description" -> Send (Top Right Icon). We appreciate your help for supporting beta program.