Windows 11 puts a short line under a process’s task bar item and widens the line when the process is the active one. The line moves when SGP is taking a picture and stops moving when the picture is done.
This morning the line was moving even when SGP wasn’t “doing” anything - the sequence it ran ended several hours ago. I got the following screenshot as the line was moving:
Not sure about the missing icon. I think it can happen in a condition where the windows taskbar “stacks” its child windows and one of the children doesn’t specify an icon. Have any child windows open?