UiPath opens another instance of Excel even when passing a workbook object


Hi guys.
Please see attached workflow.

I’m doing some work in Excel (Apply default formats) and then flowing through a switch activity to carry on with some additional work (Create SARS summary) if a condition is true.
I read in the documentation that one should pass a workbook object onto the next excel application scope to keep doing work on the same file. This does work but I’ve noticed UiPath opens another instance of Excel in the background but only in this particular project.

I’ve copied the 2 Excel scopes and switch activity to a new sandbox project and then the behavior stops.

Anyone else experience this?