Bug report

I'm trying to get PHPStan to put its tmpfiles in a separate location specifically when run in PhpStorm, and I don't really want to create an extra .neon just for this.

Not sure if there's a proper way to do this with just CLI options, but as per title, overriding sys_temp_dir did not work. Overriding TMPDIR does work, but PhpStorm doesn't give me a way to set environment variables either, so I was really hoping this would work.

Code snippet that reproduces the problem

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Expected output

$ php-8.5-pm5 -dsys_temp_dir=./.cache/phpstan vendor/bin/phpstan.phar analyze
should put tmpfiles only in ./.cache/phpstan, but it puts them in both .cache/phpstan and /tmp/phpstan.

In debug mode it works as I expected.

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