Curled needle black pine

Hi, why my JBP got 2 pairs of curled needles?
Only info I have found was from bonsainuts saying that it’s a sign of overwatering /stress.

I’ve seen small numbers of curled needles on pines for years and don’t know what it is. Stress from overwatering is always a good candidate for problems like this, but I have yet to find a good source of info about the issue.

What I’ve found is that it’s usually only a couple of needles here and there and that the rest of the tree seems fine otherwise.

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