While playing around with the snapshot today, I've noticed that if you place one of the new doors and then break the block beneath, the door drops two of itself.
This affects both Crimson and Warped doors. and appears to occur consistently, regardless of the block the door was placed upon. The other doors appear unaffected.
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Thank you for your report!
However, this issue is a Duplicate of MC-170852.
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Same applies when you break them by hand in survival mode.