When executing a command from a book inside a lectern, instead of executing it in the coordinates of the lectern, it uses the coordinates of the entity reading the book, unlike when executing commands from a sign that uses the coordinates of the sign.

This bug makes it more difficult to use the lectern for mapmakers to use it as a fixed point to calculate relative coordinates.

To reproduce

Steps to reproduce:

1. Place a lectern containing a written book with a "run_command" clickEvent:

   /setblock ~ ~ ~ lectern[has_book=true]{Book:{id:written_book,Count:1,tag:{author:j_p_smith,title:MC-143001,pages:['{"clickEvent":{"action":"run_command","value":"/setblock ~ ~3 ~ stone"},"text":"Test"}']}}}

2. Open the book on the lectern while standing a short distance away from it
3. Click on the word "Test"
   → A block of stone is placed above your head (rather than above the lectern)