Fantasy settings mean the author can get away with reduced internal consistency requirements - lots of stuff can be hand-waved away with "oh, it's magic" and people generally accept it.
And that's a pretty fundamental part of writing, to be honest. Authors want to tell stories, not histories (even Tolkein had a back-and-forth between the stories he wanted to tell and the histories that he built to back them up) - allowing flexibility and ambiguity about how magic works allows the author to tell a story and then fit the magic to the story, which means that there's always going to be internal inconsistencies. Insisting on strong internal consistency in a story with magic is basically insisting that magic in the story world is completely defined (at least in the author's mind) and the behaviour and constraints are rigidly enforced . . . at which point you're effectively writing science fiction for an alternative universe. Which is all fine and dandy, I might add, and stories like that exist, but not that many - it's a lot of work defining your story world in sufficient detail, and the kind of peple who can do that work are rarely the kind of people who can also tell a good story.
Also worth noting that even the hardest of hard science fiction has internal inconsistencies in the functioning of its' story world, because it's basically impossible to write stories anyone would want to read without them. Even something like The Martian, which was hard SF done so well that it only had a handful of inconsistencies with the known science at the time of writing, and only a few cases where new work has indicated problems with the science used in the story, still consciously chose to introduce story elements that weren't consistent with reality because otherwise Mark Watney wouldn't have been stuck on Mars alone and there wouldn't have been any story to tell.
So yeah, "fantasy story" basically means "the author is creating the story world in order to suit the story they want to tell", as well as "the author is making all this stuff up as they go along" - internal inconsistencies are to be expected, and the story shouldn't be judged simply on their existence, it should be judged on the impact those inconsistencies have on the storytelling. How a cat spirit chooses to handle cutlery is probably low on the list of things that will break the story, even if it might be a bit jarring in a visual medium where you look at it and go "huh?"