I'm unable to replicate your problem in house, I connect a SSD drive via Plugable SSD Dock to MacBook Pro 2017 and passthru it to Windows 10 guest, and it works just fine and stable.
Can you share the hardware specification of your Crucial 250GB SSD?
Thanks for your reply. My bad, my Mac is only able to report the SSD as a "JMicron Technology Corp." device and I assumed it was one of my Crucial SSDs. I've opened the drive and confirmed it is actually a Kingston SSD SSD Now V300 model SV300S37A/240G.