I placed a door on dirt, didn't like the dirt, so I destroyed to replace with cobblestone and didn't get my door back.

I also tested this on both gravel and cobblestone, the bug is consistent on my device: Sony Xperia Z1

PS. I checked to see if anyone else reported it but there was too many reports that just said "Door"

This is been a bug since 0.9.0 alpha build 4, it is still in 0.9.4 but there was no version selection for it.