Hi Phil,
I could be wrong, but it looks to me that the bumper has been painted at some point in the past, and it was done whilst still on the car. As a result, the very top edge of the bumper couldn't be properly prepped, resulting in the flaky paint that can be seen in the join.
You might get away with a "smart repair" in the short term, but I suspect it will need a bumper off repaint for a permanent repair.
Hope this helps,
Cliff
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