It seems the advancedsearch temporarily stores its search text in the text area and then quickly removes it. This creates a jarring experience.
Steps to reproduce:
- Go to https://www.mediawiki.org/w/index.php?search=booo+intitle%3Atest&title=Special%3ASearch&profile=advanced&fulltext=1&advancedSearch-current=%7B%22options%22%3A%7B%22intitle%22%3A%22test%22%7D%2C%22namespaces%22%3A%5B12%2C100%2C102%2C104%2C106%2C0%5D%7D&ns12=1&ns100=1&ns102=1&ns104=1&ns106=1&ns0=1
Note that just before it loads the advanced search interface it shows "bots intitle:test" temporarily. Then a few seconds later the intitle part is hidden. See, https://imgur.com/a/Jad6qd0 .
It just shows "bots" within the input box.