Adding a new overriding template resulted in the creation of 190 XWikiSkinFileOverrideClass

• This happens on a clone of xwiki.org
• Reproduced the bug 2 times, see screenshots
• You can see what other deprecated properties were in the bugObjects.png

Steps:

• Go to the "Overridden templates" section
• Enter the template name you want to overwrite, like 'drawer.vm'
• Press 'Add'