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it seems to be confused with the subject right next to it.. it works better at the end of the twt string.
Yarn won’t display anything. but the parser does add it to the AST in a way that you can parse it out using twt.Attrs().Get("lang")

https://git.mills.io/yarnsocial/go-lextwt/src/branch/main/ast.go#L1270-L1272

https://git.mills.io/yarnsocial/go-types/src/branch/main/twt.go#L473-L478