Enum methods are not auto-completed

[ygerlach]

Describe the bug
If a enum value is auto-completed, the auto completion does not show to_string as option, but other explicitly defined functions.

Software
OS and version: Linux Mint 21.3
Code editor: vscode 1.107.1
Vala Language Server: 0.48.7 76e38dc
Vala version: 0.56.0

To Reproduce
Source code repo:

enum Test {
    ABC,
    DEF;

    public void doSomething() {}
}


void a() {
    Test.ABC.to_string();
    Test.DEF. // auto complete here
}

I expect to see to_string and doSomething, but i only see doSomething.