Flipcase mode prevents unattended access of host app on Android

Hi,

configuration: huawei mate 9 with android host app version 13.0.7847

Whenever the flipCase is closed remote unattented access is not possible.

Locked screen is shown but no reaction to input /swiping.

When flipcase is opened normal pin unlocking is remotely possible.

Is this a bug / feature  or setting issue? Any workaround?

best gnegne