Originally reported in Inkscape's bugtracker at https://gitlab.com/inkscape/inbox/-/issues/5395 by rebio

• Download
  example_file.svg7 KBDownload
  (or create an Inkscape svg file, with a path with an Fillet/Chamfer LPE applied)
• Login to Wikimedia commons
• Try to upload the svg to Wikimedia Commons https://commons.wikimedia.org/wiki/Special:UploadWizard

What happens?:

• Upload failed, with the following warning
  • Found event-handler attribute only_selected="false" in uploaded file.

What should have happened instead?:

• No error.
  
  Marc Jeanmougin identified the problem in https://gitlab.com/inkscape/inbox/-/issues/5395#note_637538360 :

This is caused by the check on https://github.com/wikimedia/mediawiki/blob/master/includes/upload/UploadBase.php#L1670 [(https://github.com/wikimedia/mediawiki/blob/de91a0db45eaf31b57873b9d22aceaaa3d1be09a/includes/upload/UploadBase.php#L1670)] being WAY too aggressive : they check for any properties starting with "on" (reasonable given the list of properties in https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers ) in any element from any namespace which is the part that makes no sense : things in a <inkscape:path-effect> element will not get processed by a browser so there is no reason to clear its properties.