I hope you're all doing well. I just wanted to drop in and confirm that we're fully committed to resolving the current issues and I want to assure you that the Realtek chipset itself is not the cause. We are however actively investigating some unusual system behaviors in devices that use this IC purely from a configuration point of view.
The 5.6 release branch has successfully addressed a number of latency problems in the ethernet, but we acknowledge that the reachability issue remains a separate challenge. Rest assured, our team is diligently working on it and I'll swing back later after we've discussed in more detail.
Thanks for all your help in triaging this so far.