UE 5.7 Lumen: View-dependent flickering/pulsing on specific meshes in dark scenes

UE 5.7 unknown pulsing issue:

In my scene some specific meshes start pulsing only in my night/dark condition.
The pulsing depends on camera viewing angle and rotating the camera can stop it.
Other meshes seems unaffected.

What could cause this view-dependent flickering, and how can I fix it?

Thanks for any help.