Hey, not sure if this is the right place for this, but I have been experimenting in 5.5 and found that enabling MegaLights causes this crash:
Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp] [Line: 863]
Rendering thread exception:
Assertion failed: View.SubstrateViewData.SubstrateGlobalUniformParameters != nullptr || !IsSubstrateEnabled() [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\Substrate\Substrate.cpp] [Line: 704]
This occurs during shader compilation, and I haven’t been able to narrow it down beyond it only happening when you activate MegaLights, as I mentioned.