Multiblock items like beds and doors,(all i've tried so far) will drop 2 of themselves when broken from 1 specific portion. If i break a bed from the bottom half it drops 1 but if i target the pillow it drops 2. Doors its the bottom half that duplicates the door. It has been 100% repeatable at least on our 1.16 pre4 server. Works in single player as well as in creative.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-188675, which is a report that has not been resolved yet.
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