When I clone Lectern with a book in one coordinate and clone lectern with another book in that one coordinate, I was already looking at the book I was looking at and I didn't look at the clone book. I don't know if this is a bug, but it's inconvenient to make a map using a reading stand.

Even if I'm already reading the book, I hope it changes to another clone book.  Also, if you give the replication a chain delay time, strangely, it continues to replicate as if it were a repeat command block

For example

1. Put two different books on different lectern (0,-60,0), (0,-60,-1)
2. Connect the basic command block and the chain block and set the delay time of the chain block to 20
3. In the command block, Write the command that the two lecterns made in number 1 are cloned in one coordinate. (Basic command : clone 0 -60 0 0 -60 0 0 -60 2) (Chain command : clone 0 -60 -1 0 -60 -1 0 -6)

If you do 1 - 2 - 3, it will be duplicated repeatedly (I made the video frame 100fps, but this is not why, right?) :Clone is repeated, so you can't break the reading table, and the book keeps coming out endlessly. 

Plaese, In addition to the repeated clone phenomenon of the reading table I mentioned, please correct the phenomenon of reading only the same book (No. 1).