Flickering problems

Hi guys. this is my first time on this blog. I’m a issue with my design visualization: i’ve a flickering on a camera that I can resolve with these 2 command:

r.Lumen.Reflections.HierarchicalScreenTraces.MaxIterations 4
or
r.Lumen.ScreenProbeGather.ScreenTraces 0

but when I launch the “package” command, these settings are not saved and my .exe file starts flickering again.

I used unreal 5.3 and substrate materials
Many thanks