As you can see here, I've had an issue with my render. The mountains in the background seem to reflect the light sources in my scene strangely, which leads to this weird flickering.
specs: AMD Ryzen 5 3500X, NVIDIA GeForce RTX 3060 Ti, 16GB DDR4 RAM, Windows 10, Used Blender version: 3.5 Used render engine: Cycles
There are no overlapping geometry, as the mountain is flat in Material preview.
(Unfortunately I can't provide a decimated version of my file, as the blend-exchange site only accepts files below 30MB and my file still uses 43MB after removing everything unnecessary)