So on a 1703 Win10 workstation Symantec appears to be writing the “QualityCompat” into the standard registry and not Wow6432Node. So on the relevance for all of the related KB4056891 fixlets the last relevance clause
“exists value “cadca5fe-87d3-4b96-b7fb-a231484277cc” whose (it as integer = 0) of keys “QualityCompat” of key “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion” of registry”
Returns false, but if this is changed to “Native register” it works correctly.
Though I’m not sure if that was simply an accident or if Symantec should be writing it out to both locations or if this was an oversight in the rush to get these fixlets into production. Hopefully this helps.