When there is a (stone) slab on soul sand/soil, soul speed doesn't work. The slownes you get from walking does on soulsand does effect you though.
Linked issues
Comments 2
Duplicate of MC-174574
MC-184100
When a slab on soul sand/soil, soul speed doesn't work, but slownes does.
Resolved
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0
Marius Roessingh
(Unassigned)
Unconfirmed
(Unassigned)
20w20b
Retrieved
Soul Sand blocks are only 0.75 blocks tall, therefore only having a 0.25 slowness range
hope you understood d:
-LilJuiceBox