The actual blocking is done at uniform level, as the problem of having
same effect node twice is duplicate uniforms.
Fixes: QDS-11470
Change-Id: I77b15b4a207efaebff39b4f6b1700d70262abcdb
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>