possible babel/biblatex package error

[alceu-frigeri]

• I have read and acknowledged this HOWTO article:
  Submitting a MiKTeX problem report

Possible bug related to babel/biblatex packages or latex3.

after the last update I started getting error messages associated with the \MakeUppercase , \cite and \fullcite commands
(well, in fact, I have noticed that problem today, when compiling a file I knew was working just fine up to a few weeks ago).
the kind of error messages I'm getting are related to:

=====================
! Argument of __text_expand_loop:w has an extra }.

\par
l.24 \MakeUppercase
{aâãàá b}

this error happens IF I load the babel package

====================

the other case is

===============
! Argument of __text_expand_loop:w has an extra }.

\par
l.28 \cite{ABNT:NBR-14724-2011}

this error happens IF I load the biblatex package with the abnt style.

========

As said, these might be babel/biblatex bugs or, given the error message, perhaps even latex3 related
(one can find the full example by err-report.zip)

since I don't know if the problem is MiKTeX specific, or babel/biblatex (even latex3) related, I have also made a question in stackexchange (with a full description and 'minimum workable example')
https://tex.stackexchange.com/questions/665405/bug-report-on-babel-biblatex-packages-probably-latex3-related

below one can find my log files (log.zip) , workable example (err-report.zip) and installation report (miktex-report.txt).

I have tried to search the 'internet' to see if it is an already known issue, but found nothing.

Thanks for any help.

log.zip
err-report.zip
miktex-report.txt

[u-fischer]

As discussed at https://tex.stackexchange.com/a/665414/2388, the problem is that miktex missed to update the firstaid package. It still has the version from june, while on ctan there is 1.0u 2022-10-29 https://ctan.org/pkg/latex-firstaid.

[edocevoli]

Thank you, this has been fixed. Please check for updates tomorrow.