I am using emacs 26.1 on debian 10.3.

The bug is that when you copy bolded-colored text from an eshell buffer
into an enriched-text buffer, the bold shows after the copy --- but if you
then close the enriched-text file, and re-open it, the bolding is gone.

Steps to reproduce:

(1) emacs -Q
(2) M-x eshell
(3) cd /etc
(4) ls
(5) control-X 2
(6) scroll up a dozen lines using control P; then type escape-w to capture
the text
(7) find-file /tmp/blah.txt
(8) yank in the captured text (control-y)
(9) M-x enriched-text  (so make /tmp/blah.txt into an enriched text file)
(10) kill the buffer (control-x k)
(11) reopen the file (find-file)
(12) observe that although the colors are still there, the bolding is gone.