TextMesh mesh is wrong when MeshFilter present on same GameObject.

This is expected behavior.

MeshFilter and TextMesh are both components that rely on a MeshRenderer component to render the mesh. When they are both present, they are conflicting over which one gets to set the mesh that the MeshRenderer should use.

That said, we should not allow a MeshFilter and TextMesh on the same GameObject because it is not supported anyway. We'll file a separate bug bug on that.