beamer 3.58 problem with helvet and lmodern - problem with upper-case Greek

I have a problem similar to the one asked here. My minimal working example looks like this:

\documentclass{beamer}\usepackage{lmodern}\usepackage{helvet}\begin{document}\begin{frame}$\Gamma \neq \Theta \neq \Omega$$\gamma, \theta, \omega$\end{frame}\end{document}

The result looks like this with lmodern (line 2 in the mwe) in it:

and like this without lmodern

Is this still a bug in beamer?