SCAN is not working

Let's have this set of commands:
```
set a 1
set b 2
set c 3
scan 0 count 1
```

On my local machine with redis-cli I'm getting reult simular to:
```
1) "2"
2) 1) "b"
````

With try.redis.io I'm getting:
```
1) "524288"
2) (empty list or set)
```

I am not redis expert, but seems wrong to me.