PHPStan false reports on Xml

[dereuromark]

Bug report

With update to .99

Code snippet that reproduces the problem

$xmlSubProcess->children()->process[0]['name'] = $processName;
...
$xmlElement[0] = $prefix . $this->stateMachineConfig->getSubProcessPrefixDelimiter() . $xmlElement[0];
...
$xmlElement->attributes()['name'] = $prefix . $this->stateMachineConfig->getSubProcessPrefixDelimiter() . $xmlElement->attributes()['name'];

results in

  Line   Spryker/Zed/StateMachine/Business/StateMachine/Builder.php
 ------ ------------------------------------------------------------
  176    SimpleXMLElement|null does not accept string.
  227    SimpleXMLElement does not accept string.
  248    SimpleXMLElement|null does not accept string.
 ------ ------------------------------------------------------------


### Expected output

No errors as this is valid/working PHP code

[mergeable]

This bug report is missing a link to reproduction on phpstan.org.

It will most likely be closed after manual review.

[github-actions]

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