Would it be possible for you to do a kernel bisection?

First, find the first good -rc kernel and the last bad -rc kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/

Then,
$ sudo apt build-dep linux
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ cd linux
$ git bisect start
$ git bisect new $(the good version you found)
$ git bisect old $(the bad version found)
$ make localmodconfig
$ make -j`nproc` deb-pkg
Install the newly built kernel, then reboot with it.
If the issue still happens,
$ git bisect old
Otherwise,
$ git bisect new
Repeat to "make -j`nproc` deb-pkg" until you find the commit that contains the 
fix.

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https://bugs.launchpad.net/bugs/1820811

Title:
  Thunderbolt3 dock freezes X on hotplug when used with external
  displays

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