IntlDateFormatter. Timezone acronym lost when locale is changed

Question

im trying to do something like this (https://www.php.net/manual/en/intldateformatter.getlocale.php):

<?php
$fmt = new IntlDateFormatter(
    'en_US',
    IntlDateFormatter::FULL,
    IntlDateFormatter::FULL,
    'America/Los_Angeles',
    IntlDateFormatter::GREGORIAN
);
echo 'locale of the formatter is : ' . $fmt->getLocale();
echo 'First Formatted output is ' . $fmt->format(0);

$fmt = new IntlDateFormatter(
    'de-DE',
    IntlDateFormatter::FULL,
    IntlDateFormatter::FULL,
    'America/Los_Angeles',
    IntlDateFormatter::GREGORIAN
);
echo 'locale of the formatter is : ' . $fmt->getLocale();
echo 'Second Formatted output is ' . $fmt->format(0);

?>

the output is:

locale of the formatter is : en
First Formatted output is Wednesday, December 31, 1969 4:00:00 PM PT
locale of the formatter is : de
Second Formatted output is Mittwoch, 31. Dezember 1969 16:00 Uhr GMT-08:00

but i don't want the "GMT-08:00", i want to keep the PT acronym, is there any way to change the language in the date but keep the timezone acronym?

Thank you.