Weird error (probably due to PHP update) with wrong date-period returning default php objects instead of SimpUtils

[PandaHugMonster]

$dt_period = DT::walk('2022-02-24', '2022-03-30', '1 day');
// IMP  Stop the war! Save Ukraine! Slava Ukraini!
foreach ($dt_period as $day) {
  /** @var \DateTime $day - this is wrong type, it must return SimpUtils version */
  $this->assertContains("{$day->date}", $dt_expected);
}