Bugfix: use the correct assertion to test the value of an attribute-n… #3435

Job	Run time
PHP-Linter (8.3) / linter	12s
Linter / yaml-linter	5s
PHP-Linter (8.4) / linter	11s
PHP-Linter (8.5) / linter	11s
Linter / json-linter	28s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.4, windows-latest	1m 1s
Unit tests, PHP 8.3, ubuntu-latest	21s
Unit tests, PHP 8.5, ubuntu-latest	25s
Unit tests, PHP 8.4, ubuntu-latest	25s
Unit tests, PHP 8.5, windows-latest	1m 0s
Unit tests, PHP 8.3, windows-latest	57s
Security checks	0s
Quality control	0s
Code coverage	0s
Cleanup artifacts	-1s
	5m 15s

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