Description:
------------
I would expect that the factory method createFromFormat should work like the constructor parameter. 

Test script:
---------------
$date = new DateTimeImmutable('2019-11-01T12:12:40.8859136+00:00');

var_dump($date);

$date = DateTimeImmutable::createFromFormat(DateTimeInterface::RFC3339_EXTENDED, '2019-11-01T12:12:40.8859136+00:00');

var_dump($date);

Expected result:
----------------
object(DateTimeImmutable) {
  ["date"]=>
  string(26) "2019-11-01 12:12:40.885913"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}

object(DateTimeImmutable) {
  ["date"]=>
  string(26) "2019-11-01 12:12:40.885913"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}

Actual result:
--------------
object(DateTimeImmutable) {
  ["date"]=>
  string(26) "2019-11-01 12:12:40.885913"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}

bool(false)