False positive for isset on static access

[mokraemer]

having the following class

class X{
	/** @var array<string,string> */
	static $queryCache = [];

	function query(string $hash, string $query): string{
		if(isset(self::$queryCache[$hash])){ //emmits PhanPluginUndeclaredVariableIsset undeclared variable $self in isset()
			return self::$queryCache[$hash];
		}
		return $query;
	}

}

phan warns that $self is undeclared, which is obviously nonsense