The screen on my iPhone goes black when I mirror with the iOS Figma app

The following procedure:
I go into the Figma app and mirror my project that I have opened in the Chrome browser. It works perfectly, the screen I selected in the browser is mirrored on the iPhone.

However, as soon as I switch the iPhone to standby (iPhone screen off) and go back to the Figma app, which remained open, the screen in the app turns black. So I have to leave the screen in the app again and restart the mirroring. Every time from scratch. This is very annoying. Am I using the product incorrectly or do we have a bug here?

iPhone XS iOS 15.4.1