Here is the promised NEWS item that documents the ERR_EXIT fixes.
Unfortunately, explaining what changes isn't that easy because only rather
involved cases are affected. I couldn't make it shorter than what is in the
patch. And I still omitted the even more involved case fixed by 51071: fix
ERR_RETURN for functions in conditional statements
<https://github.com/zsh-users/zsh/commit/259f1e944b96715fda25f7ba227da05bdb7e600f>
.

An alternative would be to simply state that a number of ERR_EXIT bugs
affecting only corner cases were fixed, without trying to describe the
cases.

Philippe