Shadows of my lights start flickering for no apparent reason

Hello everybody,
I am currently working this project, and I am running into some trouble with the lighting.

The Lights/Shadows shouldn’t be flickering like that. It becomes very visible the first time the camera goes down the path.
I’ve done some research. But all the fixes that worked for other people sadly didn’t work for me.
Turning off Virtual Shadow Maps didn’t work, and enabling distance field shadows didn’t help either.
I’m working on the most recent version of Unreal 5.
Help is greatly appreciated

Can you replicate it on simple geometry with the same lamp? Not a lighting expert but that may help ascertain where we’d be looking. This doesn’t look like normal flickering else I would have blamed the VSMs too, this is really smooth.