The error was that FProperty didn’t have a method named “GetMetaData,” but for whatever reason, this is now working.
I’d originally written this for 5.3, but had to roll back; when I was working in 5.3 it worked just fine, but I got the error for 5.2; I noticed the 5.3 docs say GetMetaData is a member of FProperty, but in 5.2 it isn’t - but it is a member of FField, so should be accessible.
I think this was just VS getting confused (and therefore confusing me). I don’t know what changed, but it compiles OK now.