Why does the product's USB-A port display 5V/0A when idle, while the corresponding USB-C port displays 0V/0A?

This is the reason for this situation:

According to USB-IF association requirements, the USB-A port must remain always-on, thus displaying 5V/0A on the voltage and current interface when idle.

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Why does the product's USB-A port display 5V/0A when idle, while the corresponding USB-C port displays 0V/0A?
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