On Commons, we have infoboxes in categories, for example see https://commons.wikimedia.org/wiki/Category:South_Pole_Telescope . Up until recently, these were appearing down the side of the category contents, however I just saw that they no longer do this - instead a lot of whitespace is added, and you have to scroll down to get to the contents.
I don't think this is due to any change in the infobox behaviour. I can also see the same at enwp, e.g., at https://en.wikipedia.org/wiki/Category:Football_Manager - where the code hasn't been updated for some time.
Possibly this is something to do with the default settings of how mw-parser-output and mw-category-generated interact with each other? Has something just changed?