ebproof not working with metropolis beamer theme

I am trying to use the metropolis theme with beamer and the package ebproof on overleaf. (It seems this is an overleaf specific problem.) However, ebproof's prooftree environment is not working.

Here is an example of the error:

And the TeX that generated it:

documentclass[10pt]{beamer}

usetheme{metropolis}

usepackage{ebproof}
begin{document}


begin{frame}

$$begin{prooftree} 
hypo{A}
infer1{B}
end{prooftree}$$

end{frame}

end{document}