I just tested this here using VC for VS2015 2.3 update 2 and both reference modified and subscripted items display correctly when I hover over them in debug and the option for COBOL Debug Tooltip Style is set to Show COBOL occurs or referenced modified value.
In 2.3 update 2 this option has been moved to the context menu which is displayed when you right-click while debugging is in effect.
What product version are you using?
VC for VS2013 2.3 Update 2.
OK, I was getting myself confused by hovering over OCCURS variables in the Procedure Division and in Working Storage. The behavior is different between these two locations, but the consistent between native and managed code.
My apologies. I guess I developed a hair trigger after my issues with File Status on hover and conditional breakpoints.
Thank you for your support.