Messages: Produce: New data is not generated

[Haarolean]

1. Open a topic with a schema available
2. Produce a message with dummy generated data
3. Open produce again, the previously generated data remains the same

TODO:

• Regenerate the dummy data on produce

[coder-pink]

@Haarolean Hi, Can you assign this to me

[Haarolean]

@coder-pink hi, any luck? Cleaning up hanging issues for other contributors.