Z2 Mini G9 w/Thunderbolt I/O Flex Port - Blue Screen of Death

[Craig-B]

Braintrust, 

I have a BTO Z2 Mini G9 with a Thunderbolt port (Flex I/O option). I can connect a 4TB Thunderbolt Envoy Pro drive without issue. However, I have a new OWC Thunderbolt 4M2 w/4 4TB HP M.2 SSDs that once I connect to the same Thunderbolt Flex I/O port, it caused an immediate Blue Screen of Death. 

I can connect the same to my older HP 15" ZBook and while it does not crash and Thunderbolt Control Center sees the device, the drives are not found and therefore I cannot configure with SoftRaid. 

When I connect it to an iMac Pro running Windows 10 via Bootcamp, the devices is seen as are the 4 HP M.2 SSDs.

My Z2 Mini G9 has the latest BIOS and Thunderbolt firmware/drivers. 

I have never seen anything like this before. 

HP support has been of now use. 

Any thoughts or suggestions would be greatly appreciated. 

Thanks. 

[Craig-B]

Follow-up: I did some additional troubleshooting. The OWC 4M2 is a Thunderbolt 3 chases (came empty) and I installed 4 4TB HP FX900 M.2 SSDs in it (would be eventually raided at 0). I removed all of the SSDs and connected the chassis to the Z2 Mini G9 and the system did not crash and the chassis was recognized in Thunderbolt Control Center. I installed one 4TB SSD and once again connected and it was seen and recognized (single 4TB drive). I installed a second SSD and it caused another Blue Screen of Death. 

It seems that more than one M.2 SSD causes the system to crash, but no idea why.