HGETALL returns empty dict in RESP3 connection mode

**Version**: redis-py 5.0.0b2

**Platform**: Any

**Description**: 

RESP2 mode:
```
r = redis.Redis(decode_responses=True)
r.hset("test", "test", '123')
r.hgetall("test")
# {'test': '123'}
```
RESP3 mode:
```
r = redis.Redis(protocol=3, decode_responses=True)
r.hgetall("test")
# {}
```
