[Bug]: Localized calculated value has wrong index within field collection

[studio1gmbh-pimcore]

Pimcore version

11.1.5

Steps to reproduce

1. Create a field collection including a localized calculated value
2. Create a simple calculator class, that returns the current index

    // ...
    public function compute(Concrete $object, CalculatedValue $context): string
    {
        return 'I have index ' . $context->getIndex();
    }
    // ...

3. Set the calculator class in the calculated value
4. Create a class using the field collection
5. Create a new object and add field collection items

Actual Behavior

Index is always 0

Expected Behavior

Index should be same as the position within the field collection

This is probably related to #11816.

Inside the loop, the index must be updated every iteration, not just the first time, when $params['context']['containerKey'] is not set.

[kingjia90]

Fixed by #16735
Thank you for suggesting the fix

[studio1gmbh-pimcore]

@kingjia90 thx for fast fix!