fix(backdrop): define var in valid scope for all reference sites
fix(backdrop): define var in valid scope for all reference sites

Closes #9226

ServiceManagementGroup/material,ServiceManagementGroup/material,crisbeto/material,SamDLT/material,SamDLT/material,gkalpak/material,ilovett/material,gkalpak/material,ServiceManagementGroup/material,DevVersion/material,david-gang/material,gkalpak/material,miguelcobain/material,vertazzar/material,j3ski/material,gkalpak/material,imjoeco/material,marekmicek/material,angular/material,miguelcobain/material,Frank3K/material,Splaktar/material,oostmeijer/material,DevVersion/material,oostmeijer/material,clshortfuse/material,david-gang/material,profoundry-us/material,Splaktar/material,ilovett/material,DevVersion/material,hayloft/material,daniel-nagy/material,graingert/material,profoundry-us/material,angular/material,graingert/material,daniel-nagy/material,profoundry-us/material,angular/material,clshortfuse/material,vertazzar/material,Frank3K/material,imjoeco/material,Frank3K/material,bluebirdtech/material,Frank3K/material,marekmicek/material,j3ski/material,bluebirdtech/material,bluebirdtech/material,clshortfuse/material,j3ski/material,oostmeijer/material,imjoeco/material,Splaktar/material,DevVersion/material,pwistbac/material,ServiceManagementGroup/material,oostmeijer/material,crisbeto/material,crisbeto/material,hayloft/material,graingert/material,david-gang/material,vertazzar/material,daniel-nagy/material,ilovett/material,hayloft/material,crisbeto/material,pwistbac/material,SamDLT/material,pwistbac/material,miguelcobain/material,daniel-nagy/material,imjoeco/material,SamDLT/material,marekmicek/material,marekmicek/material,david-gang/material,bluebirdtech/material,pwistbac/material,graingert/material,miguelcobain/material,ilovett/material,j3ski/material,vertazzar/material,angular/material,profoundry-us/material,hayloft/material,Splaktar/material,clshortfuse/material