I have a lot of stuff on this world, so it may have to deal with that. The chests do not visually open. Visually, the top of the chest "clones" itself.
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Also, I was good and searched this time.
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Dupe of MC-64161
qmagnet
No Sonic, this is definitely a duplicate of MC-62166
I've had is plenty of time and F3+A always solves it.