Bug: ob-eshell session breaks with long running commands [9.3.1 (release_9.3.1-73-g93c11d @ /home/guraltsev/.emacs.d/straight/build/org/)]

Bug: ob-eshell session breaks with long running commands [9.3.1 (release_9.3.1-73-g93c11d @ /home/guraltsev/.emacs.d/straight/build/org/)]

[Gennady Uraltsev]

Hello everyone,

Org babel eshell does not work well with the :session argument. In
particular if the the command does not exit immediately then the results
can be arbitrary and can vary from one call to the other. Also, the
results often include the actual calling line.

Notice that executing things with sh src code does not have this session
management problem. So it seems to really be bug. 

This code illustrates the problem.

#+BEGIN_SRC eshell :results output drawer
echo test
#+END_SRC

#+RESULTS:
:results:
test
:end:

#+BEGIN_SRC eshell :results output drawer :session test1
echo test
#+END_SRC

#+RESULTS:
:results:
test
:end:

#+BEGIN_SRC eshell :results output drawer
sleep 1 ; echo test
#+END_SRC

#+RESULTS:
:results:
test
:end:

#+BEGIN_SRC eshell :results output drawer :session test2
sleep 1 ; echo test
#+END_SRC

#+RESULTS:
:results:
~/Mail $ sleep 1 ; echo test
:end:

Best,

Gennady

Emacs  : GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.10)
 of 2019-08-29
Package: Org mode version 9.3.1 (release_9.3.1-73-g93c11d @ /home/guraltsev/.emacs.d/straight/build/org/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
                     org-src-mode-configure-edit-buffer)
 org-link-shell-confirm-function 'yes-or-no-p
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-html-format-inlinetask-function 'org-html-format-inlinetask-default-function
 org-edit-src-content-indentation 0
 org-src-tab-acts-natively t
 org-odt-format-headline-function 'org-odt-format-headline-default-function
 org-special-ctrl-a/e t
 org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
 org-reveal-start-hook '(org-decrypt-entry)
 org-modules '(ol-bbdb ol-bibtex ol-docview ol-eww ol-gnus org-id ol-info
               ol-irc ol-mhe org-mouse org-protocol ol-rmail ol-w3m
               ol-eshell ol-git-link ol-man org-toc)
 org-id-link-to-org-use-id 'create-if-interactive-and-no-custom-id
 org-mode-hook '(#[0
                   "\b\205.