I've ridden a strider with a saddle and a warped wart on a stick about four or five separate times on my friend's Minecraft Realm, and the achievement popped up in the chat, but it still shows up as being locked on the achievements tab.
This is particularly frustrating because I have a goal on this particular world to complete every achiivement, and this is kinda not helping. XP
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anthony cicinelli
@Anthony Cicinelli I think so? I was in survival mode, not creative, and I don't know anything about the warped fungus on a stick taking or not taking durability. Sorry to be so unhelpful. XPP But I think it's probably the same issue.
Does MC-183764 describe your issue?