Wixlib questions

[chrpai]

I created a wixlib project using wixtoolset.sdk/4.0.2. It references wixtoolset.netfx.wixext 4.0.2 and has a simple variable search
<netfx:DotNetCoreSearch RuntimeType="desktop" MajorVersion="6" Platform="x64" Variable="DOTNETDESKTOPVERSION"/>
When I build it and look at the json inside of it it says the version is 4.0.0.0. Should that say 4.0.2.0?

Also when I lookinside, if I build as X64 I see: { "data": "Wix4NetfxBundleExtension_X64" }

When I build as ARM64 I see : { "data": "Wix4NetfxBundleExtension_A64" }

This causes issues if I consume the wixlib in a package project and build it as a different arch then the wixlib was built. Is this even supported? Is there anyway for a a package to reference a wixlib to reference another wixlib and have the arch selection deferred until the package project builds?