IN clause doesn't support SqlMapper.TypeHandler

I'm using Dapper v1.50.5 from NuGet and I have this struct

public struct ItemGroupId : System.IEquatable<ItemGroupId>
{
  public static readonly ItemGroupId Empty = new ItemGroupId(0);

  private readonly int _value;

  public ItemGroupId(int value) => _value = value;

  public static explicit operator ItemGroupId(int value) => new ItemGroupId(value);

  public static explicit operator int(ItemGroupId value) => value._value;

  public override bool Equals(object obj) => obj is ItemGroupId ? this.Equals((ItemGroupId)obj) : false;

  public bool Equals(ItemGroupId other) => _value == other._value;

  public override int GetHashCode() => _value.GetHashCode();

  public static bool operator ==(ItemGroupId left, ItemGroupId right) => left.Equals(right);

  public static bool operator !=(ItemGroupId left, ItemGroupId right) => !(left == right);

  public override string ToString() => _value.ToString();
}

and this TypeHandler

public class ItemGroupIdTypeHandler : SqlMapper.TypeHandler<ItemGroupId>
{
  public override void SetValue(IDbDataParameter parameter, ItemGroupId value)
  {
    parameter.DbType = DbType.Int32;
    parameter.Value = value != ItemGroupId.Empty ? (object)(int)value : DBNull.Value;
  }

  public override ItemGroupId Parse(object value)
  {
    return new ItemGroupId((int?)value ?? 0);
  }
}

TypeHandler seems to work everywhere but when I try to use ItemGroupId in IN clause like this
sqb.Where("EXISTS (SELECT * FROM ItemForItemGroup WHERE ItemGroupId IN @ItemGroupIds AND ItemId = item.Id)", new { ItemGroupIds = sOptions.ItemGroupIds.ToList() });
I get error System.ArgumentException : No mapping exists from object type Removed.ItemGroupId to a known managed provider native type.

I had to change it to sqb.Where("EXISTS (SELECT * FROM ItemForItemGroup WHERE ItemGroupId IN @ItemGroupIds AND ItemId = item.Id)", new { ItemGroupIds = sOptions.ItemGroupIds.Select(x => (int)x).ToList() }); to make it work.

Start by reproducing the IN-clause query with the ItemGroupId struct, its SqlMapper.TypeHandler, and the ItemGroupIds list shown in the issue. Trace parameter expansion and type-handler lookup for collection values; done means the handler is honored for each IN parameter without requiring conversion to int.