I've looked for a dupe but couldn't find one, so here it goes.
There has been at least a couple of weeks since the
infavorites: search operator is returning no results for me.
I've also tried
infavorites:mine which is equivalent to the URL above, and of course I've also tried with other user IDs. The search always returns no matches.
I'm mostly sure that the syntax is correct and was working perfectly fine last month.
Am I doing something wrong or is this actually a bug?