A double chest in a structure can be rotated, but splits into single chests when mirrored. This is because the chest block `mirror` function (using the official mappings for the name) does not change the block state `type` from `left` to `right` and vice versa, which it should do always (unless there's a plan to add mirroring the Y axis).
MC-227260
Double chests do not mirror properly in structures
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