Activating artboard with a script does not update the Artboards panel
If you click inside of an artboard with a mouse, it gets the 'active' flag and becomes selected in Artboards panel as well. So if you press Shift+O to pick Artboard Tool, you see its name and dimensions.
However, if you use method setActiveArtboardIndex() — the artboard still gets the active black border, but the panel stays unrefreshed, and if you pick the tool you get the information about a different artboard.
Sergey Osokin commented
The bug exists in Windows, Mac OS and Illustrator of different versions. Including CC 2022