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It’s just digging around really. There are a lot of undocumented hooks in ACF. From what I’ve found E has provided hooks so that you can filter just about anything, but just like WP there are a lot that you might need to find.
I started at 290 in the file you indicated and worked backwards to figure out where $args came from.
There could even be something more specific, I’m just not finding it.
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