Player Speed Too Fast on Updated Legacy World

Hello,

I have an old world that I originally created in Minecraft: Xbox One Edition, then transferred to Minecraft, and later moved to PC via Realms. I didn’t have any issues until the Caves & Cliffs update was released. Since then, my old legacy world has had an uncontrollable movement speed when playing in Creative mode, making it impossible to play. I have re-uploaded the world to Realms and tested it on other consoles, such as the Nintendo Switch, but the speed issue persists. This problem only occurs with my legacy world. I do not have any potion effects on my character. I’ve attached a video with the issue.