Same here, 16" MBP (2019) and Radeon Pro 5500M 8GB; I keep encountering the same crash message when I connect my monitor via one of the DP ports on my HP Thunderbolt 3 Dock G2. The dock firmware is up to date. Using the Thunderbolt port to connect my monitor will not cause any crashes.
My 15" MBP (2017) is rock solid with the same dock & monitor setup, no matter how many times I plug and unplug, there are no crashes at all.