Failover subscription sends first message to multiple consumers

**Describe the bug**

I have two consumers connected using a `Failover` subscription to the same topic. I first run one consumer, and after a few minutes, I run the second consumer (no messages are being produced yet).

Once both consumers are up, I start publishing messages to the topic. When this happens, **both** consumers get the first message, and from there, only the selected *active consumer* gets the subsequent messages.

It looks like a bug to me, but if this is expected, I would appreciate if you could point me out to any kind of documentation in this regard.

**To Reproduce**

Steps to reproduce the behavior:
1. Create a `persistent` non-partitioned topic.
2. Create two consumers in `Failover` mode and run them.
3. Create a producer and start publishing messages to the topic.
4. See first message being received by both consumers.

**Expected behavior**

Only the active consumer should get **all** messages.

**Desktop (please complete the following information):**

- OS: Linux (NixOS)

**Additional context**

Here are a few things that might be relevant.

Pulsar version: `2.10.0`
Pulsar Java client: `2.10.0`

I have deduplication enabled on my broker configuration:

```
brokerDeduplicationEnabled=true
```

Messages published to the topic have an `orderingKey`, as I have other service running in `KeyShared` subscription mode reading the very same messages.