I can't make DeltaDecorations to work in wasm app

[qplace1]

private string[] _decorationIds; 

async Task ApplyDecoration(StandaloneCodeEditor editor)
{
    var newDecorations = new[]
    {
        new ModelDeltaDecoration
        {
            Range = new BlazorMonaco.Range(1, 1, 2, 10),
            Options = new ModelDecorationOptions
            {
                ClassName = "yellow-decoration",
                IsWholeLine = true
            }
        }
    };

    _decorationIds = await editor.DeltaDecorations(_decorationIds, newDecorations);
}

• DeltaDecorations return new DecorationId
• CSS "yellow-decoration" is recognized on the page, I tested it against the text on the page
• Editor is populated with text and line 1 and 2 have something in it.

[serdarciplak]

The project demo app (here) also uses this method to add the blue background and the red margin marker with the call here. I don't see any issues with it. Can you check the timing of your call?