From googling it sounds like this could be an issue with the BIOS firmware? I saw some other makes of laptops which reported having this issue later had it fixed with bios updates.
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I was looking for this too and found this post on egpu.io. I applied it to my laptop and can now boot it with the egpu plugged in without BitLocker prompting me:
https://egpu.io/forums/pc-setup/bitlocker-tripped-on-reboot/
The solution involves disabling “PCR 2: Extended or pluggable executable code” in the “Configure TPM platform validation profile for native UEFI firmware configurations” setting in Group Policy.
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