Steps to reproduce:
- use the code:
class A {
    static void foo(int k) {
        if (k == 2) {
            System.out.println("HIT = " + k); // set breakpoint here
        }
    }
}


public class HelloWorld {
    public static void main(String[] args) throws InterruptedException {
        System.out.println("Start");
        for (int i = 1; i <= 100; i++) {
            int k = i;
            Thread t = new Thread(() -> {
                System.out.println("i = " + k);
                A.foo(k);
            });
            t.start();
        }

        Thread.sleep(2000);

        System.out.println("Finish");
    }
}
- compile
- use jdb to set a breakpoint and run:
>jdb HelloWorld
Initializing jdb ...
> stop at A:4
Deferring breakpoint A:4.
It will be set after the class is loaded.
> run
run HelloWorld
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
>
VM Started: Start
i = 21
i = 45
i = 11
i = 16
i = 23
i = 7
i = 51
i = 39
i = 20
i = 40
i = 31
i = 5
i = 6
i = 4
i = 41
i = 53
i = 9
i = 2
i = 13
i = 1
i = 3
i = 15
i = 22
HIT = 2
i = 10
i = 8
i = 14
i = 12
i = 17
i = 52
i = 19
i = 24
i = 44
i = 18
i = 55
i = 25
i = 56
i = 26
i = 34
i = 43
i = 37
i = 33
i = 28
i = 30
i = 32
i = 35
i = 38
i = 27
i = 47
i = 49
i = 59
i = 60
i = 48
i = 62
i = 54
i = 58
i = 64
i = 67
i = 68
i = 70
i = 73
i = 69
i = 29
i = 75
i = 77
i = 76
i = 74
i = 84
i = 81
i = 80
i = 85
i = 36
i = 86
i = 87
i = 91
i = 93
i = 92
i = 95
i = 99
i = 90
i = 96
Set deferred breakpoint A:4
i = 46
i = 61
i = 42
i = 50
i = 57
i = 63
i = 65
i = 66
i = 71
i = 72
i = 79
i = 78
i = 83
i = 82
i = 88
i = 89
i = 94
i = 98
i = 97
i = 100
Finish

The application exited

The breakpoint is fully skipped.
This was working in version before 20.