Everything wrong with Profane Ritual tested

After playing a profane ritual (PR) build and some testing, I found this:

Things about PR being a DEBUFF:
- PR is adding a debuff to enemies within range -> PR's damage does NOT stack with itself (only 1 applies)
- Other rules on debuffs sometimes also apply on PR, such as chaotic freeze, intense agony is added to its description and more.
- There are EXCEPTIONS: Dark Effigy does not shoot on PR debuffed enemies. Contagion does not interact with PR.

Things about its DAMAGE:
- Enemies randomly stop taking damage from PR while inside the AoE. On my testing this resulted in damage per cast 8k - 24k damage on the same enemy and setup (tested on a boss). Once they stop taking damage by PR, they don't take any more damage for the rest of its duration. Enemies affected by more than one PR do not have this issue. I don't know the reason for this.
- Support gems do not directly increase its damage at all as it seems, the only one is "Chaos Mastery".
- Passive notes and items only increase the damage with "increase chaos damage" description, nothing else as it seems (not even "increase chaos damage over time", although I am not 100% sure on this one).

Other BUGS:
- Profanity support gem "eats" the corpse before the cast animation, so if only 1 corpse is near, the cast will be cancelled and the corpse will still be consumed.