Time: 6/16/17, 4:00am PST
Frequency: Constant
World name: Odin
Character name: Isaac Nightfare

Mounts Affected: All horse based mounts (from Xanthos to the Unicorn) And a few others I don't actually own so I cannot name.

Steps:
1. Summon Horse
2. Set to Walk (not run)
3. Move in any direction
4. Revel in the moonwalk

I did go confirm with other players if they had the same issue and it's not just me. It's not my computer and it's not a bad file.