The property properties does not exist on Larapie\DataTransferObject\Traits\MakeImmutable. Since you implemented __get, consider adding a @property annotation.
It seems like setImmutable() must be provided by classes using this trait. How about adding it as abstract method to this trait?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation