Rumour has it that recently an airliner had a 'false' TCAS warning after it was triggered by a number of red aircraft spilling out of the top of R313? Perhaps the civvies need a TCAS filter to ignore formations of more than 4 aircraft?
Only one ac in the formation usually squawks, so how would TCAS know about the other 3/4/5/6/7/8*?
(* delete as appropriate)