You have to agree to have read the policies when signing up and they've always been pretty clear about placement rules. Not placing ads on non-content pages is a pretty basic rule and would clearly apply to this since a search result is non-content.

https://support.google.com/adsense/answer/48182?hl=en#zippy=...

Adsense is designed to have as many footguns as possible.

Footguns as a service