Bug report

PHPStan correctly recognizes that an array element is a string with this code:

\is_string($arguments['format']) ? $arguments['format'] : 'Y-m-d';

When I add a null coalesce operator to avoid invalid array accesses, this does not work anymore:

\is_string($arguments['format'] ?? null) ? $arguments['format'] : 'Y-m-d';

Code snippet that reproduces the problem

https://phpstan.org/r/0ee835f9-8142-4b60-9ce1-8a8006c96a3c

Expected output

No error.

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