CronExpresion monthly and weekdayonly skips the month when on day of Saturday

[lynnz11]

Describe the bug

Set CronExpression of weekdayonly with a certain day, e.g. 15W. The month will be skipped if the specified day is Saturday.

Version used

3.8.1

To Reproduce

[Test]
public void TestCronExpression()
{
CronExpression cronExpression = new CronExpression("0 0 12 15W * ?");
DateTimeOffset? nextFireTime = cronExpression.GetTimeAfter((DateTimeOffset) new DateTime(2024, 5, 15, 12, 0, 0).ToUniversalTime());
Assert.IsTrue(nextFireTime.Value.Month == 6, $"CronExpression failed");
}
Result is 7/15/2024

Expected behavior

6/14/2024

Additional context

[lynnz11]

Version used is 4.0.0.0