Very strange indeed.
And it doesn't even have to be a state variable, i.e.
my $c = 0;
my @partitions = map { [$c, $c += $_] } @widths;
gives the same result.
Whereas [$c+0, $c += $_] produces
[0, 2]
[2, 8]
[8, 13]
[13, 20]
and so does [my $tmp = $c, $c += $_]
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