Hello,
When I update a named range programmatically I am forced to remove the name and re-add it with the updated value. This is fine as a workaround but any cells that referred to the name can have strange visuals depending on the new value. For example, I have a named range 'Test' in which RefersTo is '=1'. I set A1 to be =Test and it displays 1 as expected. If I remove the name and re-add a new name 'Test' with RefersTo '=1000', A1 will extend into the neighboring cell.