GetTargetMountedStateInfo() issues

[sinnereso]

Ive had this function as part of my addon for nearly 9mo now with no issues but recently I began reworking the function to not just mount my "saved player @NAME" but anyoone in group that is riding a dual mount and has free pasenger slot. This is when I noticed this function is now returning true & true for GetTargetMountedStateInfo() even when noone is on a mount at all:

for iD = 1, GetGroupSize() do
		local playerID = GetGroupUnitTagByIndex(iD)
		local playerCharName = GetUnitName(playerID)
		local playerDisplayName = GetUnitDisplayName(playerID)
		local _, isRidingGroupMount, hasFreePassengerSlot = GetTargetMountedStateInfo(playerDisplayName)

I tested this extensively 9mo ago when I 1st implemented it but now I cant seem to get it to return false ever which is needed. Any suggestions?