Issue booting Ubuntu on my external hard drive from my Macbook Pro 2017 using Thunderbolt connection

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I have Ubuntu installed on my LaCie external hard drive. The hard drive supports both USB 3.0 and Thunderbolt connection. I use MacOS on Macbook Pro 2017 and when I want to use Ubuntu, I shutdown my Mac, power up, hold the option key to load the boot manager, connect the external hard drive and my Mac will detect Ubuntu on the external drive, then I boot Ubuntu.
I used to be able to boot Ubuntu using either USB3.0 or Thunderbolt connection. But ever since I started using Apple’s Thunderbolt monitor with my Macbook, I can’t boot Ubuntu using Thunderbolt connection, I can only do so using USB3.0.
When go into boot manager of my Macbook and I connect the hard drive using Thunderbolt, it will detect Ubuntu, but when I try to boot it, I go into BusyBox and I can’t even find my hard drive on /dev directory. Funny thing is, when I use Ubutnu, I can use Thunderbolt display, but it just won’t detect anything other devices connected via Thunderbolt.
I tried resetting SMC but that didn’t work. Does anyone have any suggestions? It works perfectly fine when use USB3.0 connection, but I would like to be able to boot Ubuntu on my external hard drive using Thunderbolt connection again.

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