uncaught TypeError when calling array_map with null callback and non-empty array

[frontenac]

The following works in 4.30 but throws a TypeError in 5.0

array_map(null, [1]);

https://psalm.dev/r/fd479a295e

Internal Psalm error on line 101 - /vendor/vimeo/psalm/src/Psalm/Internal/Provider/ReturnTypeProvider/ArrayMapReturnTypeProvider.php: Psalm\Internal\Provider\ReturnTypeProvider\ArrayMapReturnTypeProvider::Psalm\Internal\Provider\ReturnTypeProvider\{closure}(): Argument #1 ($sub) must be of type array, Psalm\Type\Union given

array_map(null, []); runs without exception.