Mark Oteiza <mvoteiza@udel.edu> writes:

>>From -Q:
>
> 1. open a new buffer foo.tex
> 2. insert a commented line followed by an uncommented one; e.g.
>
> % dog
>
> cat
>
> 3. Put point at beginning of buffer
> 4. M-h
>
> I would expect the line with "dog" to be marked, but instead, the lines
> following are marked.

(This bug report unfortunately got no response at the time.)

I can reproduce this bug in Emacs 26.1, but not in Emacs 28, so it seems
like this has been fixed...  or, rather, it's changed: