Hi! Glad you're enjoying the assets.
Re: the missing animated tiles. It isn't a mistake that animations haven't been set up for those tiles, as they're simple rotations of the other tiles. Since the tile palette in unity supports rotations, I could reduce the amount of busy-work setting the tiles and animations up in Unity by omitting those. I can imagine changing the anchor points messed up the position of the rotated tiles. Best case: I think you should be able to fix it by just giving those particular tiles in the palette some position offsets?
If rotating is a no-go for your project for whatever reason, unfortunate answer is that you may have to set up the animations for each of them (which was very tedious, hopefully you'll be spared that). The tiles are all there in the spritesheets folder, but I believe I only 'sliced' what was necessary, so that would be the first step.
Disclaimer: I'm not a user of Unity myself, and I haven't kept up with any changes to Unity that may have happened since I created the package. There may be a better solution.