After upgrading to 2025.4.3, I noticed that when unmanaging a node from the details page, it presents a prompt for a reason this is being unmanaged and displays the reason next to Node Status in Node Details. Great improvement. It doesn't prompt if unmanaging from the popover menu, seems only from the details page, but hopefully that's coming in the future.
I would like to write a query to pull a report on that information but I can't find it on the nodes entity, inherited properties, etc. Any ideas where that is stored?