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TUSB4020BI: power on sequence on two-level hub

Part Number: TUSB4020BI

Hi team,

     Support need

     The scenario used by the customer has two levels of hub cascade connection, as shown in the figure below. The power-on time of Hub 2 would be earlier about ten seconds than Hub 1. 
①.For the cascade connection of Hubs as shown in the figure below, do Hub1 and Hub2 have power-on sequence requirements? If Hub2 is powered on before Hub1, will the two devices(设备已) connected to Hub2 be fail to be recognized?
② If the Hub2 device cannot be recognized due to the power-on sequence problem, is there any way to avoid it in the software?

yours

nan