Edit message header/footer template links lost in 6.2.42?

[dpc22]

Version

6.2.42

Installation method

rpms from http://sympa-ja.org/download/rhel/ installed on RHEL 7.

Also installed from source on my Ubuntu workstation to confirm the issue.

Expected behavior

https://my-site/sympa/editfile/listname/message_templates should include:

Added in distributed messages
Edit Message footer: If this file is not empty, it is added as a MIME attachment at the end of each message distributed to the list.
Edit Message header: If this file is not empty, it is added as a MIME attachment at the beginning of each message distributed to the list.

Actual behavior

This text and links are missing.

Additional information

This would seem to be related to NEWS.md:

• Files for message footer and header were renamed to message_footer and message_header #507.

/usr/share/sympa/default/web_tt2/editfile.tt2 contains, for example:

[% item1 = 'message.footer'
item2 = 'message.header' %]

If I replace the default template with one where:

all instances of "message.footer' are replaced with "message_footer"
all instances of "message.header" are replaced with "message_header"

then things work as I expect.

At the same time I would have expected lots of other people to be asking about this, and I can't see anything on the issue tracker or the sympa-users mailing list. I'm willing to believe that I'm just missing something really obvious as a Sympa novice.