Code completion doesn't offer methods from the same class

There is a simple groovy class:

class NoCCTest {
    private String method1() {
        return "Ahoj"
    }
        
    private void method2() {
        String a = meth|od1()
    }
} 

Char `|` indicates curret position. When you invoke code completion at this position, there are no suggestions.  See the picture

When you write `this.` before method name, then the cc is resolved correctly: