I have this Problem on many Sites (ca. 25 Websites). All the same Problem after Update.

I have activated this function on a new site (updated from 4.2.6 to 4.2.7) with the original Action-Template. I have activated the action "User". When i made some things in the backend, then i will become this message:

Letzte Benutzeraktivitäten

Dies ist die letzte Aktivität eines Benutzers auf der Website.

Aktivität | Datum | Erweiterung | Name

But under "Aktivität", "Datum" etc. i will no become data.
The Template is this:

Letzte Benutzeraktivitäten

Dies ist die letzte Aktivität eines Benutzers auf der Website.

Aktivität | Datum | Erweiterung | Name
{MESSAGES} {MESSAGE} | {DATE} | {EXTENSION} | {USERNAME}
{/MESSAGES}

Hello,
I have the same problem since updating joomla 4.2.6 to 4.2.7
{MESSAGE}{DATE}{EXTENSION}{USERNAME}

@Philippe-FRICH Thank you for your confirmation. I hope, that the problem will solved in near time....

Still not solved.
Any hints what should be put in the mail template to make it work ?

I can confirm the issue in 4.3-dev.

See #38305

It's this change: https://github.com/joomla/joomla-cms/pull/38305/files

when I revert it I get the data per email. The link looks a bit weird. I don't know if that's another issue or settings in my thunderbird or Joomla or wherever.

I submitted the "MailTemplate.php" file from joomla 4.2.6.
It does not change anything, there is always the same problem in the emails received.
{MESSAGE}{DATE}{EXTENSION}{USERNAME}

I submitted the "MailTemplate.php" file from joomla 4.2.6.

I have only exchanged the 3 or 4 lines of the pr, not the whole file.

I have tested with J!4.3-dev and the original mail template.

I received the email like 2 comments above.

Before: Like described in post #39774 (comment).

There the output after headlines is just empty (which I can confirm)

and not

{MESSAGE}{DATE}{EXTENSION}{USERNAME}

Closing as having a pull request. Please test #39850 . Thanks in advance.