Things were working, suddenly regressed

SVSim.EmulatedEntrypoint/Models/Dtos/ColosseumInfo.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// colosseum_info on /mypage/index, consumed by
+/// ColosseumEntryInfoTask.SetColosseumInfo (Wizard/ColosseumEntryInfoTask.cs:99).
+///
+/// The block is indexed unconditionally — it MUST be present, and
+/// `is_colosseum_period` MUST be set. All other fields are only read inside the
+/// `if (IsColosseumPeriod)` branch, so when no Take Two cup is active we emit
+/// the minimum payload (is_colosseum_period=false) and leave the rest defaulted.
+/// </summary>
+[MessagePackObject]
+public class ColosseumInfo
+{
+    [JsonPropertyName("is_colosseum_period")]
+    [Key("is_colosseum_period")]
+    public bool IsColosseumPeriod { get; set; }
+
+    [JsonPropertyName("is_round_period")]
+    [Key("is_round_period")]
+    public bool IsRoundPeriod { get; set; }
+
+    [JsonPropertyName("deck_format")]
+    [Key("deck_format")]
+    public int DeckFormat { get; set; }
+
+    /// <summary>Wire is "1"/"0" string in prod. Client compares with == "1".</summary>
+    [JsonPropertyName("is_normal_two_pick")]
+    [Key("is_normal_two_pick")]
+    public string IsNormalTwoPick { get; set; } = "0";
+
+    /// <summary>Used as ColorCodeId (stringified int).</summary>
+    [JsonPropertyName("is_special_mode")]
+    [Key("is_special_mode")]
+    public string IsSpecialMode { get; set; } = "0";
+
+    [JsonPropertyName("colosseum_name")]
+    [Key("colosseum_name")]
+    public string ColosseumName { get; set; } = string.Empty;
+}