Thinking about this a bit more. I think I may understand why it happens, but still think it is something the kagi team should consider fixing, if possible.
IMDb "Website popularity" is 88, Rotten Tomatoes is 929 and TMDb is 9965. So I guess during a regular search it doesn't even surface for kagi's algorithms to consider. Would be nice if it did though, and I guess that is what we are asking.
And yes, I can create a lense for it, no problem. I guess it is just slightly surprising behavior, which others also may be surprised by.