I've found this solution and it really did worked for me:
Are you using a MacBook Pro? I was happened the same bug.
Solved in the following ways.
Step1: Unplug all cables, including the charging cable
Step2: Restart the iOS simulator Source:
https://stackoverflow.com/questions/65299337/xcode-12-3-ios-14-3-simulators-yellow-dock-yellow-translucent-issues
Maybe it will help you guys too...
reichwein
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Yes, the same here ;-(