Ogg files, which i.m.h.o. are wrongly identified in Thunar as video files, are ignored for custom actions that are assigned to audio files (only). Obviously the former problem may be related to the latter, but while wrong identification is just a nuisance, I consider the files not showing up in a custom action to be a bug. To be honest: I don't think I have never come across an OGG video file, but handle OGG audio files on a daily basis. regards, JS PS. reported version is the Thunar version. Debian (testing) does not list the tca plug-in as a seperate package.
Works fine here, probably an issue in the mime database. You can check in the properties dialog in the tooltip of the Kind text.