Hello,
I am using a Lenovo Flex 5i with Fedora Ultramarine installed. Unfortunately, when connecting my laptop using USB-c to a monitor it does not work and when connecting it to a DP dock only mouse and keyboard work. I have done the post-fix for the USB-c port with dracut and also tried messing around with ectool typeccontrol but nothing helps. I have switched from Pop os where the issue also arised (earlier it did work with the Debian workaround in the docs, so maybe some Linux update broke it?).