So how about any media where Santa is seen/proven to exist? Some of the movies go on to say that actually seeing Santa takes away from the magic for some reason (apparently he’s powered by blind faith?). Others, such as Nightmare Before Christmas, show the world going on relatively as normal even with the knowledge that Santa exists (and perhaps other entities such as the Easter Bunny).
Most films that involve Santa's existence end with him erasing evidence of said existence, but he lets the kids remember him, like in The Christmas Chronicles.
I think the only outlier are the Santa Clause movies, but even then, I think Santa's existence is only known to a few people, like his kids. I haven't seen the movies in over a decade.
There is also that Family Guy Christmas episode where they sing a song about how Santa is being worked to death, but I would rather not use Family Guy in this thread.