Re: postgres_fdw aggregate pushdown for group by with expressions

I’ve performed some more tests and it seems expressions with “extract” function are not pushed down at all -
the WHERE criteria from the following query are not pushed down as well and filter is performed locally:
SELECT
  *
FROM
  t1
WHERE extract(YEAR FROM date_column) = 2023
I was under impression that “extract” meets all criteria for pushable expressions - looks like I am wrong?
What would be the expression to achieve the same but such that postgres_fdw would push it down?

What Postgres versions on both ends?

What does

select proname, prosrc,  provolatile from pg_proc where proname = 'extract';

return?