The bug
If you copy a lectern with a book on it in creative mode and keep its NBT data on the copy (CTRL+Pick block), the copy will have no book on it despite having the NBT for it.
MC-141934
Ctrl + Pick block on a lectern does not display its book despite being saved to NBT
Resolved
Fixed
16
Gecolay
coschevi
Confirmed
Low
Block states
book, lectern, nbt
Minecraft 19w02a, Minecraft 19w03a, Minecraft 19w03b, Minecraft 19w03c, Minecraft 19w05a, ..., 20w22a, 1.16 Pre-release 1, 1.16 Pre-release 2, 1.16 Pre-release 3, 1.16 Pre-release 4
1.16 Pre-release 5
Retrieved
Likely related to the fact that the lectern has a "
has_book" state, though its book is saved within its NBT data and is not dropped when broken.