Decaying Hex bug compendium

The Decaying Hex support gem has been bugged in several different ways since the start of early access. GGG are likely unaware of this as they've buffed the damage of the support gem twice now. (which is pointless considering the impact of some of the bugs)
Thus, the intent of this post is to raise awareness and improve clarity by compiling all the bugs in one place. If you know of a bug and don't see it listed here, please post a reply detailing it and I'll add it to the list after testing.

1. Decaying Hex does not scale with #% increases to damage. (e.g. "10% increased Chaos Damage")
Edit: after more testing, it seems these modifiers do apply, but don't show up on tooltip.

2. Decaying Hex does not scale with damage support gems.
Gems tested:
- Swift Affliction
- Intense Agony
- Derange

3. When Hex Bloom spreads a curse supported by Decaying Hex to surrounding enemies, Decay does not get applied. (Impending Doom does spread, so this is likely unintended)

4. Curses applied as auras using Blasphemy do not apply Decay to affected enemies when supported by Decaying Hex. (Impending Doom does not work here either, so this might be intended. If this is the case, a wording change might be good as nothing in the description indicates that this shouldn't work)