No errors reported when setting explicit type of function argument as mixed with phpVersion set to 70400

[tspencer244]

Bug report

Using mixed as explicit type with function argument on PHP 7.4 is not reported as an error.

Configuration file has phpVersion option set to 70400.

Code snippet that reproduces the problem

https://phpstan.org/r/d86d4cdd-b7ee-4f2b-a5cb-1a0d4ced3bb5

Expected output

Parameter $mixed of anonymous function has invalid typehint type mixed.

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