[Intl] Unrecognized timezones throwing errors

[Seb33300]

Symfony version(s) affected

7.0.6

Description

I am facing an exception when trying to render localized dates with twig for some timezones.

Looks like for some timezones, the Intl component uses different names than the PHP timezone list:
https://www.php.net/manual/en/timezones.europe.php

For example, in the PHP list, we have Europe/Kyiv but Intl needs Europe/Kiev.
Maybe related to the locale used?

And another issue with America/Ciudad_Juarez.

How to reproduce

I am setting the timezone to twig like this:

$this->twig->getExtension(CoreExtension::class)->setTimezone('Europe/Kyiv');
$this->twig->getExtension(CoreExtension::class)->setTimezone('America/Ciudad_Juarez');

For the first timezone, it looks to be a conflict in the timezone name, Intl is expecting Europe/Kiev:

use Symfony\Component\Intl\Timezones;

Timezones::exists('Europe/Kiev');   // returns true
Timezones::getName('Europe/Kiev');  // returns "Eastern European Time (Kyiv)"

Timezones::exists('Europe/Kyiv');   // returns true
Timezones::getName('Europe/Kyiv');  // throws exception

Timezones::getIds();  // contains "Europe/Kiev" only

Exception:

Couldn't read the indices [Names][Europe/Kyiv] for the locale "en" in "vendor\symfony\intl/Resources/data/timezones". The indices also couldn't be found for the fallback locale(s) "root".

For the second second issue with America/Ciudad_Juarez, I have no idea why it fails:

Timezones::exists('America/Ciudad_Juarez');   // returns true
Timezones::getName('America/Ciudad_Juarez');  // returns "Mountain Time (Ciudad Juárez)"
Timezones::getIds();  // contains "America/Ciudad_Juarez"

Exception:

An exception has been thrown during the rendering of a template ("datefmt_create: time zone id 'America/Ciudad_Juarez' extracted from ext/date DateTimeZone not recognized: U_ILLEGAL_ARGUMENT_ERROR").

Possible Solution

I am not sure how to solve this?
Intl component may automatically translate Europe/Kyiv into Europe/Kiev?

If not, Timezones::exists('Europe/Kyiv'); should return false and not true.

Additional Context

Maybe more issues with other timezones?
I did not try all of them.

[xabbuh]

It looks like this is related to the fact that timezones can have aliases which we handle in exists() but not in getName() (see #31354).