Hi. Thanks for the help. It does indeed know the post id. Removing the section out of the flex content makes it work. The code you posted also shows the correct post id.
However, after a little more digging I seem to have found the issue.
It seems to be a known limitation: https://www.advancedcustomfields.com/resources/clone/#limitations
Any suggestions on getting around this?
For now I’m thinking of changing the clone inside the flex field to just duplicate the data.