This issue has extended to the new “Realistic - Idle” avatar animation. This avatar animation is visually the exact same as the “Rthro Idle”, and features the same issue of the two animations being incorrectly swapped around, as described in the original post.
For whatever reason, Roblox reuploaded all of the Rthro animations as new avatar animation assets, naming them “Realistic” instead. You can find these animations in the new free starter bundles they created to work with layered clothing, like “Cameron” for example.
So now there are basically two identical sets of Rthro animations on the catalog, with the only noticeable difference being the names of the assets. I don’t understand why they didn’t just use the standard Rthro animations for these bundles like they normally do.