[Gehrman]

Thank you Cesar82
The first bug is missing in "CIUv3 3.0.0.1.b9.u1 (2021.09.11)".

The second bug
It seems to be fixed with these changes.
Without using Diskspan, of course

function BrowseArcFile(const ArcFile, Disk: String; var SrcDir: String): String;
...........................
      IDCANCEL : begin
        Waiting := False;
        ISDoneCancel := 1;
        ISDoneError := True;
        ResumeProc;
        WizardForm.CancelButton.OnClick(nil);
      end;

Change to

      IDCANCEL : begin
        Waiting := False;
        ISDoneCancel := 1;
        ISDoneError := False;
        ResumeProc;
        ClickButton(@CancelBtnClick, nil);
      end;

It is better to be like ASIS so that the installation process can be canceled by clicking Cancel.