If a player attempts to /fill (is that even a verb?) an area with chests that they could not normally place manually, the chests become invisible and the user interface is vertically displaced and overlaps with other GUIs.
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Duplicate of MC-34365.
Definitely not an urgent issue, I don't see this ever being a real problem for anybody, just thought maybe preventing people from /filling blocks in invalid locations, such as how trapdoors work, may be a good solution.