We hear your frustration entirely, and we want to assure you we're aware of this issue with Nest Hub Max not playing audio consistently in speaker groups. It's definitely not the experience we want for our users.
Many thanks for sharing that link-it helps us understand the scope of the issue better.
In the meantime, here are some troubleshooting steps that might help:
Restart your Nest Hub Max and other speaker devices: A simple restart can often resolve temporary glitches.
Double-check your speaker group settings: Make sure all devices are selected and assigned to the same group.
Ensure your Google Home app is up-to-date: Updates often include bug fixes and performance improvements.
We appreciate your patience and understanding. We're committed to resolving this issue as soon as possible and will keep you updated on any developments.