Hunters machete bonus health regen (+12 hp/sec) not working with dragon (PBE)

hunters machete: 'Gain 6 health and 3 mana per second while in combat with monsters'. 'The amount of health gained per second increases to 12 while below 50% health'. The second part doesn't activate while fighting dragon (passive works as intended with every other non-cowardly monster, including baron). tested with pantheon, soraka (don't ask) and blitzcrank. having trouble uploading screenshots but will keep trying. EDIT: imgur links 1: take smite into custom game and buy hunters machete 2: observe machete passive working perfectly against normal jungle camps 3: fight dragon and die because the passive (+12 health per second) doesn't activate when below 50% health vs dragon
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