'exclude_mode' is excluding all results on the first page

I am trying to export a view in table format by 'Selecting all results in this view' and am getting 20 results less than the total number of results selected (20 is the number of items per page). It seems when I inspect the 'exclude_list' that this is all the IDs on the first page (see first conditional statement in `ViewsBulkOperationsActionProcessor::executeProcessing`. I'm trying to work out why 'exclude_mode' is excluding all results on the first page of results for table views.

I assume with the amount of references to exclude lists that this is at least partially intentional but can't work out the logic that would suggest why excluding the first page is being done or how to disable this. Any help would be appreciated.