Remove spacing between footnotes

I am trying to remove all spacing between separate footnotes in a memoir document. Not spacing between lines within a footnote, but spacing between distinct footnotes. I have been told to set the length of footnotesep to zero, but this does not seem to work. Neither does it work to adjust parskip.

Here is a minimum working example:

documentclass[10pt]{memoir}
usepackage[T1]{fontenc}
usepackage{lipsum}

setlength{footnotesep}{0mm} % To my understanding, this should remove the spacing, but it does not seem to.

begin{document}

This isfootnote{lipsum[1]} samplefootnote{lipsum[1]} textfootnote{lipsum[1]}.

end{document}

Which produces the following document (attached as a picture). I want to remove the spacing between footnotes highlighted in red.

documentclass[10pt]{memoir}
usepackage[T1]{fontenc}
usepackage{lipsum}

setlength{footnotesep}{0mm} % Working as intended.

begin{document}

This isfootnote{lipsum*[1]} samplefootnote{lipsum*[1]} textfootnote{lipsum*[1]}.

end{document}