Affects Version/s: Minecraft 17w06a
Fix Version/s: None
Environment:Windows 10 - 64bit
Java 1.7.0_80 - 64bit
Steps to reproduce
1. Fill the area of at least 20x20 blocks with enchanting tables using the /fill command.
2. Then fill the same area with comparators (unpowered_comparator).
On top of some comparators appear floating books, as on the table of enchantment.
These books will disappear if you restart the world.