[SLO Bound] Custom site homepage changing to default dashboard automatically

Issue Summary

We have been recently reported of an issue affecting the Confluence custom homepages. Sites that had a homepage are losing this info automatically, letting the default Confluence dashboard set up.
Sites that we try to set up a homepage don't apply the changes after saving them.

Steps to Reproduce

Case A
If you had a custom homepage set, it got changed to the default Confluence dashboard with no action taken.

Case B
If you don't have a custom homepage:

1. Go to Settings > Further Configuration;
2. Edit it;
3. Set up any space to be your homepage and then save it;
4. Refresh the page.

Expected Results

Case A
Your homepage is there.

Case B
The site gets a custom homepage set according to the changes you just applied.

Actual Results

Case A
You may lose your homepage settings.

Case B
The changes don't take effect.

Workaround

It seems the setting is being properly applied now. If you face this issue, change the setting back to the desired space and give it a few minutes so the change can take effect.