Hi!
It’s actually not that. When I disabled the category/term exclusion it started to work again. Then I remembered someone had a similar bug, which is related to a certain configuration. It basically happens when categories are excluded on the frontend search settings page and the settings are hidden.
Anyways, I have fixed the bug in the code, the upcoming version has this fixed, so you don’t have to worry about updates.
To get more results don’t forget to enable the Search in content option, as I noticed it’s disabled.