I'm kind of curious if I'm the only one who have figured this bug out:
If you are a warlock using dawnblade
And you are using the ability tree "Attunement of Grace"
Try and throw "Divine Protection" on yourself, while in a healing rift.
For some reason this totally cancels the effect of the healing rift even after the "Divine Protection" has stopped healing.
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If you’re using boots of the assembler then it explains why that happens. There was a bug with that exotic that forced bungie to change it to the way you explain it but it will be reverted back next patch