FindGLEW does not identify library version
The FindGLEW module does not identify the version of the library based on any file content. This means that if your download path doesn't contain the version, the build will silently allow any version of GLEW to satisfy the dependency. This is also problematic since it is obscuring the same issue in the GLEW project exported targets by providing a more permissive fallback.
If the GLEW targets worked as expected, I'd say this module should simply be deprecated since support directly in the library is preferable, but since the same bug is over there as well, I guess it depends who gets around to it first.