This is an auto-filed bug because dev-util/dogtail installs .desktop files that do not pass validation.
The issue was originally discovered on amd64, but it may be reproducible on other arches as well.
If you think that a different summary clarifies the issue better, feel free to change it.
Attached build log and emerge --info.
Created attachment 642466 [details]
build log and emerge --info
tinderbox has reproduced this issue with version 0.9.11 - Updating summary.