It seems like doing a search such as:
ability to set a name when creating a backup site:https://github.com/YunoHost/
causes non github.com/yunohost urls to show up in the search
while
ability to set a name when creating a backup site:https://github.com/yunohost/
does work correctly
https://kagi.com/search?q=ability+to+set+a+name+when+creating+a+backup+site%3Ahttps%3A%2F%2Fgithub.com%2FYunoHost%2F&r=be&sh=4zN19YpLBk580qlTxYMn5A
Possibly related to:
https://kagifeedback.org/d/10309-inconsistently-between-webimage-search-when-it-comes-to-capitalization-sensitivity