Description:
------------
IntlDateFormatter::formatObject() fails when date has timezone type 2. Type 1 and 3 work fine. IntlDateFormatter::format() also works fine.

Test script:
---------------
<?php declare(strict_types = 1);

$typeOne = new DateTimeImmutable('today', new DateTimeZone('+0000'));
$typeTwo = new DateTimeImmutable('today', new DateTimeZone('Z'));
$typeThree = new DateTimeImmutable('today', new DateTimeZone('UTC'));
$locale = 'en';
$format = 'd. MMMM';

foreach ([$typeOne, $typeTwo, $typeThree] as $date) {
    var_dump($date);
    
    $formatter = new IntlDateFormatter($locale, IntlDateFormatter::FULL, IntlDateFormatter::FULL, null, null, $format);
    var_dump($formatter->format($date));
    var_dump(IntlDateFormatter::formatObject($date, $format, $locale));
    echo "\n\n\n";
}

Expected result:
----------------
object(DateTimeImmutable)#1 (3) {
  ["date"]=>
  string(26) "2020-01-28 00:00:00.000000"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}
string(11) "28. January"
string(11) "28. January"



object(DateTimeImmutable)#2 (3) {
  ["date"]=>
  string(26) "2020-01-28 00:00:00.000000"
  ["timezone_type"]=>
  int(2)
  ["timezone"]=>
  string(1) "Z"
}
string(11) "28. January"
string(11) "28. January"



object(DateTimeImmutable)#3 (3) {
  ["date"]=>
  string(26) "2020-01-28 00:00:00.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(3) "UTC"
}
string(11) "28. January"
string(11) "28. January"

Actual result:
--------------
object(DateTimeImmutable)#1 (3) {
  ["date"]=>
  string(26) "2020-01-28 00:00:00.000000"
  ["timezone_type"]=>
  int(1)
  ["timezone"]=>
  string(6) "+00:00"
}
string(11) "28. January"
string(11) "28. January"



object(DateTimeImmutable)#2 (3) {
  ["date"]=>
  string(26) "2020-01-28 00:00:00.000000"
  ["timezone_type"]=>
  int(2)
  ["timezone"]=>
  string(1) "Z"
}
string(11) "28. January"
bool(false)



object(DateTimeImmutable)#3 (3) {
  ["date"]=>
  string(26) "2020-01-28 00:00:00.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(3) "UTC"
}
string(11) "28. January"
string(11) "28. January"