This is doubling, right? Same family as these? https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=351371
No idea. But all of the photos in the link you posted point to the top of the door. Not where yours is.
Most of the nickels have the doubling at the top of the door w/o me looking to the link. Possibly a new variety if it's not listed.
Took a look closer in better lighting, and it was just improper lighting. I do have one other post that I believe is ABSOLUTELY a DDR: www.cointalk.com/threads/found-a-2019-p-nickel-ddr.354074/
