bug#36341: 27.0.50; Reading from the Gnus dribble file leaves data inconsistent

[Eric Abrahamsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> If I have the following in my Gnus dribble file
>
> (gnus-group-set-info
> '("nntp+news.gmane.org:gwene.org.jwz.blog.comments" 3 ((1 . 25172))
> ((unexist) (seen (1 . 1032) (1044 . 5020) (5022 . 11580) (11629 .
> 15722) (15725 . 19758) (19774 . 25172))) "nntp:news.gmane.org";))
>
> and start Gnus, then the group buffer will then always show the same
> unread count as existed in the previous Gnus session.  Entering the
> group and marking everything as read has no effect -- the group still
> shows the old number of unread articles.
>
>
> In GNU Emacs 27.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
>  of 2019-06-23 built on stories
> Repository revision: abf7d0d802728e0ae8e064683eb5fb411bad911e

Would you be willing to build an earlier emacs, from before c1b63af44,
and see if this is something I did?

Thanks,
Eric