That looks very similar to what happened on my car a couple of years after a poor quality accident repair, where whoever sprayed the door didn't get enough paint along the edge and it subsequently flaked off.
The car never went rusty as it was a genuine door with factory applied primer/rust protection, but it looked worse and worse over time as more of the paint flaked off down the edge.
If I was the OP, I'd have a really close look at the paintwork along the whole side of the car and underneath on that side to try to work out whether or not it has had an accident repair. If there's any suspicion of a poor repair, probably easiest to find another one as 3008s are fairly common.
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