suspend_data not updated upon variable change when timeline ends

I got a variable update triggered on "timeline ends" event for each slide of a project.

When the user clicks "next" or "prev" an updated version of the suspend_data is sent back to the LMS and that's correct.

If the user watches the slide till the end (variable is actually updated) and exits (eg close the scorm player/browser/whatever) then the suspend_data is not updated and at the next launch and resume the variable still has the "old" value.

Is it possible to force this kind of update in some way? 

thanks

regards

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