Mac pro (2013) fails to see usb 3.0 connected drives in boot selection screen

Hi,
I am using the late MacPro and have three drives attached via an USB 3.0 hub (Anker Uspeed USB 3.0 7 Port Hub).
The hub has a VIA VL812 chipset with the latest firmware update (9081) - I have verified this.
My problem is, when I enter the boot device selection screen (by pressing the alt-key during startup) none of the drives is recognized.
When I plug any drive directly into one of the four USB 3.0 ports of the MacPro, thereby bypassing the hub, it becomes visible and I can use it to boot.
AFTER the boot process, when OS X has finished loading, everything works fine. I have used two of the drives to backup several GBs of data from my main drives (connected via Thunderbolt) with no issues.
Is anybody able to connect drives through a USB 3.0 hub and use them in the boot selection screen? Which USB hub do you have?
Thanks
Martin

Got the latest firmware?
Computer
Model identifier
EFI Boot ROM version
SMC version
Mac Pro
Mac Pro (Late 2013)
MacPro6,1
MP61.0116.B04 (EFI 2.0)
2.20f18 (SMC 2.0)

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