Placing a book on a lectern and removing it causes the book not to stack except with other books which have also been placed and removed from a lectern.
Steps to Reproduce
Sign a book and make several copies of it.
Place one of the copies on a lectern.
Remove the book.
Expected Behavior
The removed book will stack with the other copies.
Actual Behavior
The removed book does not stack with the other copies.
Confirmed, the difference is that lecterns add the
resolvedtag to the book item