bug#43169: Emacs Lisp function list

[pejas]

Goood day,
working in a file in Lisp Interaction Mode I found an unexpected 
behavior.
Here is a section from that file:
;;;  section from file in Lisp Interaction Mode  ===========

     (list 1 2 3 4 5 6 7 8 9 10 11 12)
(1 2 3 4 5 6 7 8 9 10 11 12)

     (list 1 2 3 4 5 6 7 8 9 10 11 12 13)
(1 2 3 4 5 6 7 8 9 10 11 12 ...)
e
     (list 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20)
(1 2 3 4 5 6 7 8 9 10 11 12 ...)

;;;  another context n

     (setq l1 (list 1 2 3 4 5 6 7 8 9 10))
(1 2 3 4 5 6 7 8 9 10)

     (setq l2 (list 11 12))
(11 12)

     (setq l3 (list 11 12 13))
(11 12 13)

     (append l1 l2)
(1 2 3 4 5 6 7 8 9 10 11 12)

     (append l1 l3)
(1 2 3 4 5 6 7 8 9 10 11 12 ...)

;;;   End of section =========================================
I supose that it is a bug ?
I would be happy if you could send me some information
on this!
Wolfgang Pejas,  Bielefeld, Germany