Great news! So this problem will just go away by itself then. Until then
I will use the texmathp-tex-commands solution as a workaround.

Thank you everyone for sharing your thoughts!

On 8/28/20 8:55 AM, Carsten Dominik wrote:
> Hi,
> 
> AUCTeX has taken back this change, realizing that texmathp.el is also
> used in contexts where the mechanisms of AUCTeX to find out about LaTeX
> packages being used does not work.  I do think this is already fixed in
> the latest AUCTeX version.  At least it is fixed in their git.
> 
> - Carsten
> 
> Carsten
> 
> On Fri, Aug 28, 2020 at 7:09 AM Kyle Meyer <k...@kyleam.com
> <mailto:k...@kyleam.com>> wrote:
> 
>     Stefi writes:
> 
>     > It might be a change to texmathp.el. It is part of Auctex and
>     checks if
>     > math mode is on or off. I could not find align environment in the list
>     > of default environments. Maybe that has changed.
>     >
>     > However, I added align and align* to "Texmathp Tex Commands" from the
>     > customize browser (open a .tex file to customize auctex).
>     Tab-expansion
>     > is working now. Can anyone confirm?
>     >
>     > In my .emacs, it added to custom-set-variables:
>     > '(texmathp-tex-commands (quote (("align*" env-on) ("align" env-on))))
> 
>     Yes, that results in expansion on my end as well.
> 
>     It looks like this issue was introduced with AUCTeX's 91701704 (Delete
>     overhead in extending font lock range of math expression, 2020-06-11).
>     If you're getting AUCTeX from ELPA, the regression is included the
>     current version there (12.2.4, 2020-06-29).
> 
>     At the start of this month, it was fixed in f04a508f (Restore all math
>     environments in texmathp.el, 2020-08-01), so the issue should go away
>     with the next update that lands on ELPA.
> 

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