[MM3-users] Template variables in list:user:notice:post

when I add $hyperkitty_url in the postorius template list:user:notice:post, this variable is not expanded, but rests in clear text, like: Das Archiv befindet sich hier: $hyperkitty_url

Moreover, when I use $listname. (the dot after the variable name!), no confirmation arrives. Leaving a space between the variable name and the ‚.' helps.