We’ve never promised that the stable branch would be bug free. It’s stable in that it doesn’t change frequently. Stable gets a release every 4+ months, with small security and critical bug fixes in between. Plugins are updated far more frequently, and keep pace with tests-passed.
We’ve discussed this before, no formal plans at this time. As Falco suggested already, if you choose to modify the default tracking branch like you did, you’ll also likely need to modify how you install plugins, to pin a commit.