Once upon a time, shortly after Minecraft 1.16 was released, I loaded my animation preset world into it, so I started building some stuff for a project I was working on. Then when I was done, I went to load it in Mine-Imator. But it turns out that the world importer hates 1.16 (even when it's not the nether), so not only that I can't use the build, but I can't use anything in that world until Mine-Imator is releasing its next update (That world is my primary world for animation presets)... Now I am pretty much stuck with no way to animate with those presets when necessary...
The end.