Voomhelp can not be called if modeline is set

[yabuki]

Hello, I am maintainer of vim-voom package in Debian GNU/Linux. I received a bug report.

#987513 - vim-voom: Voomhelp can not be called if modeline is set - Debian Bug report logs
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987513

Could you reproduce this problem?

[yabuki]

I checked in my environment. It happened.