When using a soul speed enchantment, you can run off of soul blocks and keep the enchantment's speed for a few extra moments, even while not being on soul blocks.
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This is not a duplicate of that. That bug report is referring to the effect staying while flying, while this report is showing how the effect continues after you land on another block for a few seconds, despite the other blocks not being soul blocks.
You can also stand on non soul blocks and keep the soul speed forever until you move.
I am able to reproduce this just fine in 20w21a
In 1.16 Pre-1, you can still keep the soul speed infinitely when placing a block above you and then fly in creative mode. You are not touching the block, but the FOV presists until you leave that space.
But yes, running onto non soul speed blocks does not presist the soul speed effect for a short while anymore.
Relates to MC-175409.