g_key_file_load_from_file segfaults on "Key[*]="like lines

When trying to use lxdm-greeter-gtk, lxappearance or lxsession-edit with glib2 2.68:

glib2 appears to segfault trying to read any lines like..

Name[*]=*
Comment[*]=*

..from .theme and .desktop files in folders /usr/share/icons/, /etc/xdg/autostart and ~/.config/autostart.

Removing all those lines and leaving only plain Name=anything and Comment=anything lines, it reads the files without crashing.

further reading: https://bbs.archlinux.org/viewtopic.php?id=264780