Jumping on soul sand with the new enchantment "soul speed" jumps like you didn't have the enchantment at all. link to videos:
video 1: https://drive.google.com/file/d/17P-F4lDoZWU84tspr0qEDE-Arf2igNWg/view?usp=sharing
video 2: https://drive.google.com/file/d/1cfLn-BRu9c0APhB6-Ksh3f5N_ajw52yT/view?usp=sharing
video 2 is better
Thank you for your report!
We're actually already tracking this issue in MC-174469, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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