When jump on grass path, soul sand or farmland,player will be rebounded.
It's behavior seems to be like slime block push me using a piston.
Also, walking on soul sand will not decrease walking speed.
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Thank you for your report!
We're actually already tracking this issue in MC-166386, 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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