Bo-Katan (Mand'alor) healing with healing immunity

Isn't that just from the max health increases from the ancestral resolve? The Galactic Legend uniques do similar things, as well as the Commander Tano unique that changes between max health boosts if there are more or less allies than enemies. Same thing happens with Lord Vader right now when he gains 'Health Up' on a special from a datacron and then loses the buff he "heals" back up to full health because his health pool without the buff is smaller than it was when he had the buff - even if he has Heal Immunity he will go up in % of health he has and then can re-gain the buff and be at full health and have the higher health pool. Changing this would just make that interaction inconsistent across the game, unless you change all of those interactions.