Variant type broken on `head` CH

variant_fail.go

package main

import (
	"context"
	"fmt"

	"github.com/ClickHouse/clickhouse-go/v2"
)

func main() {
	conn, err := clickhouse.Open(&clickhouse.Options{
		Addr: []string{"localhost:9000"},
	})

	if err != nil {
		panic(err)
	}

	ctx := context.Background()
	const ddl = `
		CREATE OR REPLACE TABLE test_dynamic_exceeded_types (
			  c Dynamic
		) Engine = MergeTree() ORDER BY tuple()
	`
	if err := conn.Exec(ctx, ddl); err != nil {
		panic(err)
	}

	testTypeCount := func(typeCount int) func() error {
		return func() error {
			batch, err := conn.PrepareBatch(ctx, "INSERT INTO test_dynamic_exceeded_types (c)")
			if err != nil {
				return err
			}

			for i := range typeCount {
				typeName := fmt.Sprintf("Tuple(\"%d\" Int64)", i)
				if err := batch.Append(clickhouse.NewDynamicWithType([]int64{int64(i)}, typeName)); err != nil {
					return err
				}
			}
			if err := batch.Send(); err != nil {
				return err
			}

			rows, err := conn.Query(ctx, "SELECT c FROM test_dynamic_exceeded_types")
			if err != nil {
				return err
			}

			if err := rows.Close(); err != nil {
				return err
			}
			if err := rows.Err(); err != nil {
				return err
			}
			return nil
		}
	}
	if err := testTypeCount(300)(); err != nil {
		panic(err)
	}

}

Setup

Failing with clickhouse-server:head

$ docker run -d -p 9000:9000 -e  CLICKHOUSE_SKIP_USER_SETUP=1 clickhouse/clickhouse-server:head

$ go run variant_fail.go
panic: code: 36, message: Variant type with more than 255 nested types is not allowed

goroutine 1 [running]:
main.main()
	/home/kavi/src/play-go2/variant_fail.go:61 +0x325
exit status 2

Passing in clickhouse-server:25.12

$ docker stop $(docker ps -q)

$ docker run -d -p 9000:9000 -e  CLICKHOUSE_SKIP_USER_SETUP=1 clickhouse/clickhouse-server:25.12

$ go run variant_fail.go

$ clickhouse-client --query "SELECT count() FROM test_dynamic_exceeded_types"
300