${__user.login} builtin Grafana variable in Grafana v7.1.0-099791b7pre (e65dbcfea1) not working

Created a Dashboard variable to pass logged in user info via ${__user.login} builtin Grafana variable. Grafana version is v7.1.0-099791b7pre (e65dbcfea1) but it is not working from Dashboard. I can see the correct values are passing and getting in Variable section though.

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