Properly handle prefix = null #1398

Job	Run time
Linter / yaml-linter	4s
Linter / json-linter	28s
PHP-Linter (8.5) / linter	13s
Linter / ecmascript-linter	-1s
Linter / style-linter	-1s
Unit tests, PHP 8.5, windows-latest	56s
Unit tests, PHP 8.5, ubuntu-latest	27s
Security checks	0s
Quality control	0s
Code coverage	0s
Cleanup artifacts	0s
	2m 6s

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