Noticed a very frustrating bug earlier today:
When adding a flow and deactivating existing players for that new flow, Dorico will delete any manual staff spacing adjustments made to those players in other flows. This means that if you want to create a new flow and only use some players, you will have to redo your manual spacing adjustments from everything you’ve done earlier. As far as I can tell, this doesn’t affect horizontal spacing or item repositioning. It only applies to staff spacing.