I get a seemingly similar crash as Unreal Engine Issues and Bug Tracker (UE-150253). All r.RayTracing Config are False for me, is one difference. I have deleted Binaries, Intermediates, etc., and that did not fix the problem.
Assertion failed: UniformExpressionCache.CachedUniformExpressionShaderMap == Material.GetRenderingThreadShaderMap() [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\ShaderBaseClasses.cpp] [Line: 358] UniformExpressionCache should be up to date, RenderProxy=LandscapeMaterialInstanceConstant_2 Material=WorldGridMaterial FeatureLevel=3
Windows 10, Unreal Editor 5.1.1-23901901+++UE5+Release-5.1