This is something I've noticed for a while now; though I've struggled finding an example image that both illustrates the issue well and doesn't make me look (too) deranged 
Take the following image:
I came across it and I want to use reverse image search to find the artist and a higher resolution version. Using Kagi returns no results however (shared query link if those work with rev. image search):
Google is able to find the image no problem, with the second result even giving exactly what I wanted (artist) on the second result:
Bing is similarly able to find it, and gives me the artist name as well:
Finally, Yandex returns the poorest results out of all, but still is able to find the image and artist name:
I know reverse image search is a complicated and difficult beast, but I would really like some improvements in this area as I personally use it a lot. Kagi performs decently on most images but when it fails it falls flat on its face like this. Additionally I'd at least expect Yandex's results given that Kagi partnered with them specifically to provide RIS if I'm not mistaken.