QUnit.module.only including surprising tests

[smcclure15]

Using latest QUnit 2.15.0 via CLI.

Repro:

QUnit.module.only('Module A', () => {
    QUnit.test('Test A', assert => {
        assert.ok(1);
    });
});

QUnit.module('Module B', () => {
    QUnit.test('Test B', assert => {
        assert.ok(0);
    });
});

QUnit.module('Module C', () => {
    QUnit.test('Test C', assert => {
        assert.ok(0);
    });
    QUnit.module('Module D', () => {
        QUnit.test('Test D', assert => {
            assert.ok(0);
        });
    });
});

I expect that only Test A is executed, but in fact Test D is also run (demonstrated by the failing verification):

TAP version 13
ok 1 Module A > Test A
not ok 2 Module C > Module D > Test D
  ---
  message: failed, expected argument to be truthy, was: 0
  severity: failed
  actual  : 0
  expected: true
  stack: |
        at Object.<anonymous> (/SNIP/demo.js:22:11)
  ...
1..2
# pass 1
# skip 0
# todo 0
# fail 1

I verified that this does not reproduce in release 2.13.0, introduced in 2.14.0, and could very well be related to #1527.