I have the same problem on my MacBook Pro (16-inch, 2019), with the CalDigit USB-C Pro Dock (which is confusingly actually Thunderbolt 3). I have a 4K screen attached to the Dock over HDMI. I get the kernel panic with "modified after free" when I plug in the dock.
I'm pretty sure the kernel panics started with the Big Sur 11.3.1 update for me. The 11.4 update didn't fix it.
My wife is using the same dock with her M1 MacBook Air and does not see the issue.
sbesselsen31
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution