Parser error doesn't point at the problematic line in case of extra double quote

rule "rule1"
         when
         then
                 System.out.println("1"");
end
  
rule "rule2"
         when
         then
                 System.out.println("2");
end
 
rule "rule3"
         when
         then
                 System.out.println("3");
end

[20,0]: [ERR 102] Line 20:0 mismatched input ''
[20,0]: [ERR 102] Line 20:0 mismatched input '<eof>' in rule "rule1"
[0,0]: Parser returned a null Package