Created attachment 68490 [details]
Screenshots with Comments
I believe that that started before 3.6, but I did not test, for details please see screenshot.
I found this with "LibreOffice 18.104.22.168” English UI/ German Locale [Build-ID: f8fce0b] on German WIN7 Home Premium (64bit) during my investigations for "Bug 55903 - UI: Zoom In (+) icon does nothing"
No problem with Themes Crystal, Galaxy, High Contrast
Ivan Timofeev committed a patch related to this issue.
It has been pushed to "master":
fdo#55927: copy .uno:View100 icon from .uno:Zoom100Percent
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.