When installing different packages I see the following error message:

gtk-update-icon-cache: The generated cache was invalid.
warning: %triggerin(gtk3-tools-3.24.34-150400.3.6.1.x86_64) scriptlet failed,
exit status 1

This happens after installing the package zypp-gui
because such package installs some icons in
/usr/share/icons/hicolor/16x16/places
that have spaces in their name.

The issue was fixed upstream in zypp-gui since version 0.2.0
therefore tumbleweed is not affected by this bug.
But Leap 15.5 and 15.6 are.

There are two possible ways to fix the issue in Leap:
1) upgrade zypp-gui to version 0.2.0 or later
2) modify the spec file in this way:

 %prep
 %autosetup
+for i in data/icons/country/*\ * ; do mv "$i" ${i// /.} ; done

 %build