I have a problem where detail meshes on the terrain I create are invisible on WebGL, they are visible in the Windows build, and inside Unity itself. I have added a screenshot showing the problem. As is shown, the shadows are still being cast.
I have tried solving it by changing the models, its materials, and disabling several graphic settings, such as: Vertex Compression, Optimize Mesh Data, Colouring, GPU Instancing. The objects are visible when I don't place them using the Terrain Tool, however I don't want to resort to manually placing them.