Strompi3 V1.71 Mode "Wide->mUSB->Battery": Only first mode is used as Primary Source

Hello,
I ran into this: When setting up input mode to "Wide->mUSB->Battery" it works fine when wide input is connected. RPi starts when connected to mUSB but all my StromPi stuff isn't working anymore. It behaves as RPi would be connected without it.
Is that the behaviour to be expected?