Arbitrary phantom combo points

[GizzleBizzle]

Describe the bug
Skills that should add a combo point always do it, but sometimes they remain hidden and cannot be used. They are on the target and become visible/usable when we manage to apply a combo point from another method.

It seems to be a problem with proximity. Using skills very close to a target awards phantom combo points. If we use the same skills from almost maximum melee distance the combo points are awarded normally and can be used.

Steps to reproduce

1. Use Sinister Strike or Sap on a target touching their back.
2. There's a good chance the player won't get combo points (1 for SStrike, 2 for Sap) and cannot use skills that consume combo points (like Eviscerate)
3. Step back a few yards and use SStrike again, while being a bit farther away than before.
4. You should get 1 combo point from that ability and unlock the previous combo point (or points if you had used Sap in the beginning), therefore you should have 2-3 combo points in total.

The combo points are always applied but sometimes the client doesn't see them. If a player registers 1 combo point and hides the following 4, eviscerate will still deal damage as if there were 5 combo points on the target.

However it blocks using Eviscerate if a player manages to hide all combo points.

Expected behavior
Every combo point gained should be added and shown next to the target's avatar.

Screenshots
Sap at short range (should award 2 combo points)

Sap at long range (awards 2 combo points)