Bug report

private readonly \SplObjectStorage $store;

public function __construct()
{
    $this->store = new \SplObjectStorage();
    $this->store[(object) ['foo' => 'bar']] = true;
}

Results in:

Readonly property foo::$store is already assigned.

Seems to be related/similar to: #8929

Code snippet that reproduces the problem

https://phpstan.org/r/ce3b5b97-2dfd-403e-8be0-1c8d38e0cf87

Expected output

No error

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