I recently installed fedora 32 on my DELL Precision 7530. Unfortunately if I am connected to the thunderbolt dock my laptop is not booting, it’s freezing at the DELL splash screen. I had Ubuntu 18.04 and 20.04 installed and with Ubuntu this problem did not appear. I can boot with a fedora live stick and connected to the TB Dock without problems. Also a new install of Ubuntu is working just fine.
I assume there must be a setting or kernel/driver related issue? If I boot my device without TB Dock connected, fedora is booting and perfecly working even if I connect the TB dock after the device is up and running.