If you ride a strider, you won't get the advancement "This Boat Has Legs" in creative menu. Using warped fungus on the stick won't lose durability in creative mode but you still use it, so I think it's a bug.
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I rewrote the description because it was inncorect. I wanted to say that this advancement isn't working in creative mode.
@unknown it was resolved as a duplicate. See the parent report MC-183764
You need to use the Warped Fungus on a Stick to get the advancement.
MC-183764