bug: Error when creating multiple reliable channels

[nxtnish]

Description

When creating more than one reliable channel, we are getting

"Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'payload')".
    at ReliableChannel.processIncomingMessage (reliable_channel.js:242:86)
    at eval (reliable_channel.js:232:24)
    at eval (subscription.js:128:26)

Expected Behavior

Create mutliple reliable channels without any issues

Steps to Reproduce

1. Create 2 reliable channels:

      const test = await wakuClient.join({name: "tester"});
      const test2 = await wakuClient.join({name: "tester2"});

2. Send a message

   setTimeout(() => {
                        test2.sendMessage({text:"Hello"});
                    },5000)

3. Error occurs

The join method looks like this:

   const symKey = this._hexToUint8Array(await this._toSymHeyKey(secret));
        const routingInfo = AutoShardingRoutingInfo.fromContentTopic(this.topic, DefaultNetworkConfig);

        const encoder = createEncoderSymmetric({contentTopic: this.topic, symKey, routingInfo, ephemeral: true, sigPrivKey: this.ownKeys.bytes.privateKey});
        const decoder = createDecoderSymmetric(this.topic, routingInfo, symKey);

        const _wakuChannel = await ReliableChannel.create(this.lightNode, name, this.senderId, encoder, decoder);

...and the send method like this:

         const protoMessage = this.dataPacket.create({
                id: random(),
                sender: this.senderId,
                payload: new TextEncoder().encode(JSON.stringify(payload))
            });

            const serialisedMessage = this.dataPacket.encode(protoMessage).finish();
            const messageId = _wakuChannel.send(serialisedMessage);

Everything works fine as long as we only have 1 active channel.