I updated to latest code from zzo upstream, and hugo version to match.
Using my own branch to add build timestamp and remove all tags from cloud that are only used once. Aside from that, I don't have any customizations. FF merge worked, no conflicts.
https://github.com/VictorZakharov/hugo-theme-zzo
Search now works on main page
https://www.neolisk.blog/
but not on tag page:
https://www.neolisk.blog/tags/algorithm/
Do you have an idea?

I have a fix, it works.
(function initFuse() {
var xhr = new XMLHttpRequest();
xhr.open('GET', "/index.json");
I have fixed this issue with this commit f321503b94fafa405666acfec7c574ae50c60323
Most helpful comment
I have a fix, it works.