$talks = get_field('conference_talks', false, false); print_r($talks); Array (  => 3997  => 3998  => 3996  => 3995  => 3994 )
as opposed to:
$talks = get_field('conference_talks'); print_r($talks); Array ( )
so it at least returns something, but it has appeared to caused some of the other custom fields to return incorrect values.
I guess the other fields were messed up because it was no longer return the post object and instead the post ID (aside: I’m guessing this is similar to changing the Return Format from Post Objects to Post IDs) so where before I had things like:
$user = get_field('talk_speaker'); the_field('talk_description');
I now need:
$user = get_field('talk_speaker', $post); the_field('talk_description', $post);
which I have done and seems to have everything working.
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