I was healing a solo queue BG today when I noticed most of my heals would not connect with a target.
- Resistant Flesh did not heal anybody but myself, sometimes not even that. Magicka got deducted each time though. This was also true if i was at 100% HP not taking any damage while the teammate in front of me was losing a lot of HP over a prolonged period.
- Renewing Undeath did not heal anybody but myself for the most time. Sometimes teammates got a heal.
- Intense Mender did not heal anybody but myself, even if i was at 100% HP not taking any damage while the teammate in front of me was losing a lot of HP.
- Radiating Regeneration worked for the most part.
- Life Giver only applied to me, even when i wasn't taking much damage and had much more HP left than the guy in front of me, for whom it was intended.
I could burn through my entire magicka without seeing my target receiving any heals from me or any noticeable HP increases besides from when the target used its own heals.
Since it was solo queue I don't know if it was a visual bug on my end or if they really did not receive any HP. But given that I had a total of 55k healing done at the end of the BG while basically spamming heals non-stop and I had a lot more damage done from a few light & heavy attacks and crimson procs, I think it is safe to assume the latter is the case.