class browsing not working in 5.2.4 and 5.3.1

Hi,

Running Debian Testing. Been working on the DUNE PDELab tutorials 
<https://gitlab.dune-project.org/pdelab/dune-pdelab-tutorials> for a 
couple of weeks and things are just fine in Kdevelop 5.0.3 and 5.0.4. 
Upgraded lately to 5.3.1 and all of a sudden class browsing is not 
working anymore, and namespaces are not recognized anymore. It's fine in 
simple code without anything fancy. But as soon as you encounter 
anything slightly unusual, like an #if preprocessor statement or class 
instantiation, class browsing dies. It happens also with 5.2.4 AppImage 
and I had to go back to 5.0.4 AppImage to continue work. Did not test 
5.1. Any idea what the cause could be?

Thanks,

Ziad