TYPO3 Core

Same with this Bug for a year ago

https://forge.typo3.org/issues/96907

The error seems to appear with a [page["uid"]] query

Can be closed

In TYPO3 v11 I found return $array[$this->nodes['attribute']->evaluate($functions, $values)] in GetAttrNode - and it's a valid concern.

symfony/expression-language v5.4.21 was the last release that is compatible with PHP7 and it's unchanged there:
https://github.com/symfony/expression-language/blob/5.4/Node/GetAttrNode.php#L97

I have changed the [page["uid"]] query which eliminates the warning messages

from

[page["uid"] == 1]

to

[traverse(page, "uid") == 1]

I think we can close this issue. This problem will arise when updating to PHP 8, and affects the underlying dependency symfony/expression-language