Problem: A post type has a repeatable field group which itself contains a nested repeatable field group. When displaying the post, how to display the nested field groups?
Solution: Add a View to the post template which displays the first-level repeatable field group, which includes a Query Filter to display field groups which belong to the post where this View is shown.
In the Loop Output section insert another View, which displays the second-level field group, and which includes a Query Filter to to display field groups which belong to the current post in the Loop.
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