Trello notification settings reverting after board permission level changes

Teams often configure Trello for low-noise alerts by disabling board-level activity notifications, watching specific cards, enabling due-date reminders, and using Butler automation for targeted messages. A reported limitation is that changing a board's permission level—such as upgrading from Free to Business Class—may reset these notification preferences and require reconfiguration.

The unresolved question concerns the scope and persistence of that reset. It is not clear whether the change affects only board-wide toggles or also individual card watchers, due-date reminders, and Butler rules. There is also uncertainty about whether any low-noise configuration can be exported, saved as a template, or otherwise preserved before a permission change occurs, and whether restored settings will behave identically to the original configuration.

Which Trello notification settings are reset when a board's permission level changes, and is there a supported way to preserve or restore a low-noise configuration across that transition? Can Butler rules and card watchers be scoped or exported to prevent broad automation from recreating notification noise after preferences revert?