GlobalTable not working when using multiple instances

[Hamdiovish]

Checklist

• [x] I have included information about relevant versions
• [x] I have verified that the issue persists when using the master branch of Faust.

Steps to reproduce

Running the following app in 2 instances, then by pushing a message to one partition, the instance listening to the related partition detect the message and update the GlobalTable, whilst the other instance will not update its version of the GlobalTable and keep showing nothing.

import faust
from faust.cli import option

app = faust.App(
    'hello-world',
    broker='kafka://localhost:29092',
    key_serializer='raw',
    value_serializer='raw',
    store="rocksdb://", 
    topic_disable_leader=True,
    )

greetings_topic = app.topic('greetings-topic',partitions=2,key_type=str, value_type=str,internal=True)
greetings_table = app.GlobalTable('greetings-table',partitions=2,key_type=str, value_type=str,default=str)

@app.agent(greetings_topic)
async def greet(greetings):
    """run: faust -A app worker"""
    async for event in greetings.events():
        k = event.key
        v = event.value
        print(f"processing: {k}: {v} on partition: {event.message}")
        greetings_table[k]=v

@app.command(
    option('--k', type=str, default='a',help='The key.'),
    option('--v', type=str, default='0',help='The value.'))
async def sim_greeting(self, k, v, p):
    """simulate: faust -A app01 sim-greeting --k a --v 0"""
    await greetings_topic.send(key=k,value=v)

@app.timer(interval=1.0)
async def plot(app):
    for k in greetings_table:
        print(f'[{k}:{greetings_table[k]}]')

Expected behavior

All instances should detect GlobalTable updates.

Actual behavior

The GlobalTable is not synced across instances.

Versions

• Python version: 3.7.12
• Faust version: v1.10.3
• Operating system: Ubuntu 18
• Kafka version: 2.8-IV1