I've only used the set with the reinforced gauntlets. I've noticed it works on and off. I have had the bonus not trigger in dungeons and I tried to take pieces on and off to get it working again with mixed results. Have noticed similar things in single player foundries when not at full health. Still testing for consistency/reproducibility but some strange trends there.
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I've tested it with many different encounters, and the only one that I could sort of tell was working, was Sunburst. So my answer is yes, it is still bugged.
Best way to test it is to use a damage encounter that doesn't heal (Daunting Light), and if you don't get healed while using it then its not working.
Just use an encounter and look in the log. It should say "Seekers Beacon heals you for "<font color="orange">HAMSTER</font>" hitpoints" or something like that
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Module 4 Comprehensive DC guide |Module 4 MoF CW Handbook |New! Scourge Warlock Guide| NW Numbers and Mechanics guide |Crit, Power and DPS guide | Dungeon Delving guide and more
Best way to test it is to use a damage encounter that doesn't heal (Daunting Light), and if you don't get healed while using it then its not working.