Unable to bind to an object parent property

[sn4k3]

I'm trying to bind to a parent object property but it throw error:

BindingException: No field found at 'Section.Length'.

Line: [SerializeWhen($"{nameof(Section)}.{nameof(SectionHeader.Length)}", 96, ComparisonOperator.GreaterThanOrEqual)]

Code:

public class SectionHeader
    {
        /// <summary>
        /// Gets the section mark placeholder
        /// </summary>
        [FieldOrder(0)]
        [FieldLength(MarkSize)]
        [SerializeAs(SerializedType.TerminatedString)]
        public string Mark { get; set; } = null!;

        /// <summary>
        /// Gets the length of this section
        /// </summary>
        [FieldOrder(1)] public uint Length { get; set; }
}

public class Header
    {
        public const string SectionMark = "HEADER";
        
        [FieldOrder(0)] public SectionHeader Section { get; set; }

        [FieldOrder(1)] public float PixelSizeUm { get; set; } = 47.25f;

        /// <summary>
        /// Layer height in mm
        /// </summary>
        [FieldOrder(2)] public float LayerHeight { get; set; }

        [FieldOrder(3)] public float ExposureTime { get; set; }

        [FieldOrder(4)] public float WaitTimeBeforeCure { get; set; } = 1;

        [FieldOrder(5)] public float BottomExposureTime { get; set; } 

        [FieldOrder(6)] public float BottomLayersCount { get; set; }

        [FieldOrder(7)] public float LiftHeight { get; set; } = DefaultLiftHeight;
        
        /// <summary>
        /// Gets the lift speed in mm/s
        /// </summary>
        [FieldOrder(8)] public float LiftSpeed { get; set; } = SpeedConverter.Convert(DefaultLiftSpeed, CoreSpeedUnit, SpeedUnit.MillimetersPerSecond); // mm/s

        /// <summary>
        /// Gets the retract speed in mm/s
        /// </summary>
        [FieldOrder(9)] public float RetractSpeed { get; set; } = SpeedConverter.Convert(DefaultRetractSpeed, CoreSpeedUnit, SpeedUnit.MillimetersPerSecond); // mm/s

        [FieldOrder(10)] public float VolumeMl { get; set; }

        [FieldOrder(11)] public uint AntiAliasing { get; set; } = 1;

        [FieldOrder(12)] public uint ResolutionX { get; set; }

        [FieldOrder(13)] public uint ResolutionY { get; set; }

        [FieldOrder(14)] public float WeightG { get; set; }

        [FieldOrder(15)] public float Price { get; set; }

        /// <summary>
        /// 24 00 00 00 $ or ¥ C2 A5 00 00 or € = E2 82 AC 00
        /// </summary>
        [FieldOrder(16)] [FieldLength(4)] public char PriceCurrencySymbol { get; set; } = '$';

        /// <summary>
        /// 80
        /// </summary>
        [FieldOrder(17)] [SerializeAs(SerializedType.UInt4)] public bool PerLayerOverride { get; set; } // bool

        [FieldOrder(18)] public uint PrintTime { get; set; }

        /// <summary>
        /// spotted on 516
        /// </summary>
        [FieldOrder(19)] public uint TransitionLayerCount { get; set; }

        /// <summary>
        /// spotted on 516
        /// </summary>
        [FieldOrder(20)] public uint TransitionLayerType { get; set; }

        //[SerializeUntil((char)'P')] [FieldOrder(21)] public List<byte> Offset { get; set; } = new();

        /// <summary>
        /// 0 = Basic mode | 1 = Advanced mode which allows TSMC
        /// </summary>
        [FieldOrder(21)] [SerializeWhen($"{nameof(Section)}.{nameof(SectionHeader.Length)}", 84, ComparisonOperator.GreaterThanOrEqual)] public uint AdvancedMode { get; set; }
        [FieldOrder(22)] [SerializeWhen($"{nameof(Section)}.{nameof(SectionHeader.Length)}", 86, ComparisonOperator.GreaterThanOrEqual)] public ushort Grey { get; set; }
        [FieldOrder(23)] [SerializeWhen($"{nameof(Section)}.{nameof(SectionHeader.Length)}", 88, ComparisonOperator.GreaterThanOrEqual)] public ushort BlurLevel { get; set; }
        [FieldOrder(24)] [SerializeWhen($"{nameof(Section)}.{nameof(SectionHeader.Length)}", 92, ComparisonOperator.GreaterThanOrEqual)] public uint ResinType { get; set; }
        [FieldOrder(25)] [SerializeWhen($"{nameof(Section)}.{nameof(SectionHeader.Length)}", 96, ComparisonOperator.GreaterThanOrEqual)] public uint Unknown { get; set; } = 1;

        public Header()
        {
            Section = new SectionHeader(SectionMark, this);
        }
}

What i'm doing wrong?

[bevanweiss]

Like all of these, can you condense this down into the smallest reproducible example (i.e. with just three fields and the two classes.
And then include it into a test case with an instance showing what you expect to be the class format data, and an array of what would be the serialized data.
This will make it trivial for someone to investigate the library code, and provides a test case to improve the testing coverage for the future.