Description:
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When adding an inverted interval containing microseconds, 1 second miss in the final result (with PHP >= 8.1 but not < 8.1)

See https://github.com/kylekatarnls/datetime-bug/runs/2456014545

Test script:
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$date = new DateTime('2021-04-05 14:00:00');
$interval = new DateInterval('P0DT10799S');
$interval->f = 0.999999;
$interval->invert = 1;
$date->add($interval);
$string = $date->format('Y-m-d H:i:s.u');

echo $string;

Expected result:
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2021-04-05 11:00:00.000001

Actual result:
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2021-04-05 11:00:01.000001