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TPS25831-Q1: Connecting a Type A mobile battery to TPS25831-Q1 through Type-A to Type-C cable

Part Number: TPS25831-Q1

Hello,

My customer has some questions about BUS voltage when IN and EN are off and BUS is driven at 5V.
This scenario is like, connecting a Type A mobile battery to TPS25831-Q1 through Type-A to Type-C cable.

Q1:
At the above scenario, my customer is observing ~5V at IN. Could it be a problem or allowed from USB spec point of view?

Q2:
In the first place, does the USB spec allow connecting a source only USB charger to a source only mobile battery port?

Best regards,

K.Hirano