Opening CMakeLists.txt in editor causes QtCreator to crash

 I've noticed that with qtcreator6-rc1 (and the betas that preceded it), opening a CMakeLists.txt file in the editor crashes. This crash does not affect qtcreator5.
How to reproduce:
Steps I followed to reproduce the crash:

• load the project (e.g. open project, select the CMakeLists.txt file ; qtcreator loads the project without issue)
• in the left-hand pane, expand the project, double click on the CMakeLists.txt file to open it in the editor ; qtcreator segfaults and dies. Any other action that would also open the CMakeLists.txt file (e.g. add a new source file) will also cause it to crash.

I'm using Ubuntu 21.10 in a docker container
I'm using qt6.2.1 (from source release tarball)

I'm using  qtcreator6-rc1 (from source release tarball)

The CMakeLists.txt file and the crash backtrace are both attached.