The snippet provided by GTM says to include preview variables in both `iframe` and `script` code. But in `buildParts` it's only appended to the `script` code. Screen from GTM saying to append it in both tags: 
The snippet provided by GTM says to include preview variables in both
iframeandscriptcode. But inbuildPartsit's only appended to thescriptcode.Screen from GTM saying to append it in both tags:
