This sounds interesting. In the latest healer build video of Aragon (video link below), he mentions that Blessed Advantage master boon does not work and he suggests to use Blessed Resilience instead. If Blessed Resilience also has problems, it may be good to review those master boons as these two are important for healers.
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https://www.youtube.com/watch?v=Je0luQHo2xw
edit: video is moved at the bottom of the message