ViaBackwards

• Fixed errors with tamed nautiluses in 1.21.11->1.21.9
• Fixed errors with some entity data in very old worlds in 1.21.11->1.21.9
• Fixed world border lerping in 1.21.11->1.21.9 (by MrKinau)
• Fixed overworld fog color in 1.21.11->1.21.9
• Fixed left hand setting not working in 1.21.11->1.21.9
• Fixed mannequin skins not applying in 1.21.9->1.21.7 (note that custom skin textures based on anything but player profile textures will not be supported; by Owen1212055, EnZaXD)
• Fixed pale oak shelf mapping in 1.21.9->1.21.7 (by EnZaXD)
• Fixed handling of text components in objective/score packets across versions

If you want to get larger version updates early, consider supporting me via https://viaversion.com/donate. See the previous update notes for more info.