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TUSB4041I: TUSB4041I crystal oscillate timing

Part Number: TUSB4041I

Hi, support team

My customer has the questions as follow:

When do the crystal start to oscillate?
Do the crystal oscillate when the host is detected? Or is it irrelevant to the host detection?

I have two test boards,
One of them: crystal starts to oscillate after detecting the host, and can communicate with the host normally.
The other one: crystal starts to oscillate before the host is detected, and cannot communicate with the host.
Can you tell me the reason for the crystal oscillate before the host is detected?

Thanks so much.

Best regards,
Yuki