Module Stream Persistence Across Rocky Linux 8→9 Upgrade: Uncertain Behavior

Goal

Determine whether a module stream enabled on Rocky Linux 8 remains active after upgrading to Rocky Linux 9.

Constraints and Uncertainty

The dnf module system records enabled streams and preserves them across minor releases, but the official documentation does not specify how stream state is handled during a major distribution upgrade. Reproducible builds depend on fixed module versions, so any change in stream state could break consistency.

Questions

1. Does an enabled module stream automatically persist when a system is upgraded from Rocky Linux 8 to 9?
2. If the stream is not retained, what default stream does dnf select for that module after the upgrade?
3. Is there a documented method to preserve or re‑enable module streams automatically during a major release transition?