Incorrect behavior of IfIssetToCoalescingRector

[yguedidi]

Bug Report

Subject	Details
Rector version	1.2.10
Installed as	composer dependency

Minimal PHP Code Causing Issue

See https://getrector.com/demo/b74a1b1b-f13c-4f65-a7a1-a23c36ca40c7

<?php

final class DemoFile
{
    private string|null $value;
    
    public function run(string $param)
    {
        if (isset($this->value)) {
            return $this->value;
        }

        return $this->value = $param;
    }
}

Responsible rules

• IfIssetToCoalescingRector

Expected Behavior

This gives return $this->value ?? $this->value = $param;
Would have expected return $this->value ??= $param; directly, seems not catch even after additional runs of Rector

[samsonasik]

is the result equals? if yes, then it is a feature, not a bug, as that's possible improvement.