Then your update bumped your game onto the queue for staff to have a look. It can happen. And while on the queue, it is delisted.
If you have a webgame, people do not see the file name of your zip file that contains the web game. It is very odd to see a file name on a devlog on a project that does not have downloadble files. I would not be surprised, if that triggered the queuing.
https://itch.io/t/4120453/unofficial-search-and-indexing-faq