Have noticed that since the 8.90.3 update the search function has not been working on addons.
I’ve tried 3 different boxes and each have the same behaviour, when downgrading to 8.90.2 its all working again. I believe this is due to the kodi version being used in the update.
I think it is kodi bug. I tested latest kodi 18 nightlies on my android tv device and there also search does not work with some streaming addons. Kodi 18 nightly from beginning of may works ok