The G.E.A.R. Tracking Beacon (the alternative to flight master's whistle for Gnome character who have done thier heritage quest) is appearing in 2 places, both in the generic items list and in the heartstone alternative list, removing line 141 should fix it

line 118 (correct):
168862 -- G.E.A.R. Tracking Beacon

line 141 (wrong):
168862, -- G.E.A.R. Tracking Beacon

Fixed

I think you removed the wrong line

The item is an alternative version of the flight master's whistle, but now is only visible in the hearthstone menu (it's not an hearthstone)

I've made a pull request for the fix if it's ok

oh ) I will fix it with the next release but it will be ready maybe tomorrow, not sure.