This is an issue mainly on NetBSD , looks like a bug since 2009? I bet that not even it's maintainer does not use this window manager - well well no surpices if some people hate BSD's , primadonna maintainers that usually boot to windoze...
how to fix it:
nakeDeb is a french* Debian based derivative distribution intended to deliver an ultra-minimal debian installation allowing you to quickly install a working system or use it as a lightweight live backup.
*fear not, the distro is way useful for non-French speakers , like me. It is in fact my main OS on the PC , at least not the crap-o-bloat of Gnome/KDE , Fluxbox is bit ancient here - 1.3.5 from... 2011 ! the "latest" one is 1.3.7 (2015? IIRC) not that much of difference as no super-duper new features are there.
Feel free to install - play and customise this gem!
for more info: https://nakedeb.arpinux.org/
cheers to Arnault !!
