Applied Changes to Routing Group Priorities Not Persisting

[mawning]

Describe the bug
When trying to update a gateway priority tier via PATCH on /api/v2/routing/gateway/group/priority the API reports success (200) but the tier is not actually updated, even after applying a POST on /api/v2/routing/apply

To Reproduce
In the SWAGGER API...

Update a Gateway Priority Tier to a new value using PATCH on /api/v2/routing/gateway/group/priority
Apply the routing changes using POST on /api/v2/routing/apply
Verify the Tier has not changed using GET on /api/v2/routing/gateway/group/priority or via the webGUI

Expected behavior
The Gateway Tier is updated to the desired value

Screenshots or Response
N/A

pfSense Version & Package Version:

• pfSense Version: 24.11-RELEASE (arm64)
• Package Version: v2.4.2

Affected Endpoints:

/api/v2/routing/gateway/group/priority

Additional context
Discussion 706