I'm using the latest version of the game. But you were right about the mod. I reinstalled the game and the animations are working now. Which, again, is super weird because I've never had this happen with any other outdated walkthrough mod. Did the dev just change over to WEBM format in this release?
The dev updated the build a few hours after it went live on Patreon and here.
I mean how can the mod work correctly when it isn't updated for the game? This mod goes deep into the game, it adds a custom gallery, changes the script, makes dialogue edits, and other things.
Along with changing the animations to WEBM (this is why the mod is being rebuilt), he also disabled the gallery in this update and is moving to a per episode gallery in the future.
You got lucky then when other mods work because most won't work correctly as they won't have the new content in them. You should never use a mod that isn't designed for the version it states unless the mod says it is universal or will work with future versions. You are only setting up yourself to issues.