When soul speed was added it was said to only be collected through bartering or bastions. However, I have managed to obtain a soul speed 2 book through a raid. This is not ment to happen.
How to reproduce:
Start a raid. (Make sure you have a looting 3 sword. It makes it easier.)
Kill all the raiders in a raid and if they drop enchacnted books check for soul speed.
This may take a while but I obtained it in my first 1.16 raid.
Thank you for your report!
We're actually already tracking this issue at MCPE-72494, so I will resolve and link this ticket as a duplicate.
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