'Meaning of different Folder-icons in Visual Studio for Mac 2022 (preview) Solution Pad

What do the different colored dots at the bottom right-hand corner of the folder icons in the Solution Pad in Visual Studio 2022 Preview (for Mac) mean?

In this screenshot below, I am using Xamarin, but after trying to make changes via Xcode, my iOS-app stopped working. I then removed the existing iOS-project from the solution and added a new one, but I have not been able to get it work / open in the iPhoneSimulator since then. I therefore suspect the folder-icons are indicating that the common-project is probably not linked(?) correctly with the new iOS-project, but perhaps its telling me something else?

Screenshot of Solution pad



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