Ref T13319. Currently, transactions about changes to a default form value use a raw internal key for the affected field and don't show the actual value change.
An ideal implementation will likely require us to specialize a great deal of rendering, but we can do much better than we currently do without too much work:
- Try to pull the actual EditField object for the key so we can getLabel() it and get a human-readable label (like Visible To instead of policy.view).
- Add a "(Show Changes)" action that dumps the raw values as more-or-less JSON, so you can at least figure out what happened if you're sophisticated enough.