Symfony version(s) affected: 4.4

Description
Languages::exists('es_419') is not working in intl 4.4 where the same code worked with 4.3.

How to reproduce

• Checkout intl repo, latest version
• Add assertion in \Symfony\Component\Intl\Tests\LanguagesTest::testExists:
  $this->assertTrue(Languages::exists('es_419'));
• run the test: phpunit --group intl-data --filter testExists
• tests will fail

Repeat the same steps with 4.3 and the test will be green.

Possible Solution
I tried to dig in the code but with no luck so far.

Additional context
The language validator in symfony 4.4 will also fail due to this bug.