Levers can be placed on both the top and bottom halves of Iron doors, causing them to be dropped when activated, and the door to open and close very quickly.
Please note this issue may exist in versions before 21w13a, but it has been discovered in this version.
Video: https://youtu.be/OgGF7aSu91c
Linked issues
duplicates 1
Comments 2
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We're tracking this issue in MC-140276, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This also occurs with wooden doors and trapdoors, or with buttons.