Current instance world should have the delete data button greyed out, not missing entirely
Happyrobot33
Instead of the button not being there at all for the current world you are in, it should be greyed out and give a popup when you press it that lets you know that you cant actively be in the world to clear the data
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Blackrobe
Was just about to make this post. The website tells you that you need to leave the world to reset, but in game there is no button at all.