uSync Migrator and plan to make nested content go through the conversion process in v8 (which it doesn't by default).

nestedcontentv8convertion.cs

using uSync.Migrations.Core;
using uSync.Migrations.Core.Handlers;
using uSync.Migrations.Core.Legacy;
using uSync.Migrations.Core.Migrators;
using uSync.Migrations.Core.Plans;
using uSync.Migrations.Core.Plans.Models;
using uSync.Migrations.Migrators.Core;

namespace MyMigrations;

/// <summary>
///  migrator to mark nested content as something we should convert for v8.
/// </summary>
[SyncMigrator(uSyncMigrations.EditorAliases.NestedContent, typeof(LegacyNestedContentConfiguration), IsDefaultAlias = true)]
[SyncMigrator(uSyncMigrations.EditorAliases.NestedContentCommunity)]
[SyncMigratorVersion(8)]
public class NestedContentMigratorV8 : NestedContentMigrator
{ }


/// <summary>
///  migration plan, sets up v8 nested content as something we should migrate.
/// </summary>
internal class NestedV8Plan : ISyncMigrationPlan
{
	private readonly SyncMigrationHandlerCollection _migrationHandlers;

	public NestedV8Plan(SyncMigrationHandlerCollection migrationHandlers)
	{
		_migrationHandlers = migrationHandlers;
	}

	public int Order => 11;
	public string Icon => "icon-cloud color-red";

	public string Name => "Migrated legacy Nested Content -> Nested Content";

	public string Description => "Nested content from v8 through the converter";

	public MigrationOptions Options => new MigrationOptions
	{
		Group = "Convert",
		Source = "uSync/v9",
		Target = $"{uSyncMigrations.MigrationFolder}/{DateTime.Now:yyyyMMdd_HHmmss}",
		Handlers = _migrationHandlers.SelectGroup(8, string.Empty),
		SourceVersion = 8,
		PreferredMigrators = new Dictionary<string, string>
		{
			{ uSyncMigrations.EditorAliases.NestedContent, "NestedContentMigratorV8" },
			{ uSyncMigrations.EditorAliases.NestedContentCommunity, "NestedContentMigratorV8" },
		}
	};
}