The bug
Soul Speed consumes durability in creative mode
Steps to reproduce
Obtain Soul Speed boots
Walk on Soul Speed blocks
Expected result
Durability is not used on any items in creative mode
Observed result
Durability of Soul Speed boots is used in creative mode ❌
This bug was reported previously as MC-174464 but was fixed, so i don't think it should be a duplicate, unless someone has already reported this for 1.21 snapshots. I couldn't find a bug report from 1.21 snapshots and only found MC-174464 and its duplicates
Can confirm