As the title suggests, as of this week the Q field of the /search/advanced API endpoint is behaving strangely. Last week entering the text "Hello World" in the Q field would return many articles, however as of today no articles are returned.
You can view an example here: https://api.stackexchange.com/2.2/search/advanced?order=desc&sort=activity&q=hello%20world&site=stackoverflow
Is there any chance this could be fixed? Our application depends on users being able to enter freeform text in the Q field to perform searches.
Searching for a single word that is also a tag like "java" seems to work https://api.stackexchange.com/2.2/search/advanced?order=desc&sort=activity&q=java&site=stackoverflow