redis cache bug - main failed once demo with dropped connection

main.go

package main

import (
	"context"
	"fmt"
	"github.com/go-redis/cache/v8"
	"github.com/go-redis/redis/v8"
)

const key = "key"
const newKey = "new-key"
const value = "value"

func main() {
	client := redis.NewClient(&redis.Options{})

	redisCache := cache.New(&cache.Options{
		Redis: client,
	})

	err := client.Ping(context.Background()).Err()

	if err != nil {
		panic(err)
	}

	fmt.Println("PING OK")

	err = redisCache.Once(&cache.Item{
		Key:            key,
		Do: func(item *cache.Item) (interface{}, error) {
			return value, nil
		},
	})

	if err != nil {
		panic(err)
	}

	fmt.Println("ONCE OK")

	fmt.Println("---------")
	fmt.Println("DROPS CONNECTION")
	fmt.Println("---------")

	err = client.Close()

	if err != nil {
		panic("Failed closing the connection")
	}

	err = client.Ping(context.Background()).Err()

	if err == nil {
		panic("expecting ping error")
	}

	fmt.Printf("PING ERROR (OK): %v\n", err)

	err = redisCache.Set(&cache.Item{
		Key:            newKey,
		Value:          value,
	})

	if err == nil {
		panic(err)
	}

	fmt.Printf("SET ERROR (OK): %v\n", err)

	err = redisCache.Once(&cache.Item{
		Key:            newKey,
		Do: func(item *cache.Item) (interface{}, error) {
			return value, nil
		},
	})

	if err == nil {
		panic("expecting once error, got nil")
	}

	fmt.Printf("ONCE ERROR (OK): %v\n", err)
}