I saw this as well a couple of days ago in GNOME Help (yelp) 3.26.0. It got fixed yesterday with the 3.28.0 upgrade. Sadly, man page formatting got wrecked a little bit because long lines don’t wrap anymore.
For those who didn’t know GNOME Help (yelp) will display man pages (because there’s no button or GUI for it), type CTRL-l (letter ell), then erase the:
or whatever else is in the box. This is a secret underground box that appears in the icon bar ABOVE the search box that appears when you hit the magnifying glass. Then type:
or whatever other man page you like. Enjoy.
p.s. Forgot to say I’m running on a Librem 15 v3 running GNOME 3.28.0 under PureOS GNU/Linux 8
$ uname -a
Linux flip 4.15.0-2-amd64 #1 SMP Debian 4.15.11-1 (2018-03-20) x86_64 GNU/Linux