Wrong line/column numbers for method and closure blocks

Under certain circumstances code blocks (BlockStatement) of MethodNode and ClosureExpression have just [-1,-1,-1,-1] for line and column numbers, while parent (MethodNode, ClosureExpression) is ok. Sometimes even some statements in the block have [-1,-1,-1,-1] coordinates.

Sample - method x:

class GroovyClass {
    def x() {
        String a

        
    }
}

In this situation MethodNode [2,5,6,6], code BlockStatement [-1,-1,-1,-1] , ReturnStatement [-1,-1,-1,-1]