Culmination Support Gem not working with Rake, Thunderous Leap or Wind Serpent's Fury

When testing this, the Culmination Support Gem is not working with Rake, Thunderous Leap or Wind Serpent's Fury.

For Wind Serpent's Fury Culmination can't be socketed, even though Wind Serpen'ts fury is a Melee Attack Skill which does not already gain Combo.

For Rake and Thunderous Leap Culmination can be socketed and their equipped skill symbol shows a counter that counts up as you stack combo.

However, when you use the skill, Rake or Thunderous Leap, the combo is not removed. When culmination is used on Rake, using Rake also makes combo go up instead of using it.

Rake and Thunderous Leap are melee attack skills.
Rake is even a Melee Strike skill.

Especially on Rake I was hoping to use Combo from Culmination, as it would really be cool to apply one big bleed in this way.

An input from GGG is highly welcome.
Will this still be fixed or does it work as intended as it is?
Thank you.

Correction:
Apparently Rake does gain damage from Culmination, but when using Rake, the combo is not removed. This is game breaking, as you can then spam rake with massively increased damage.
This has to be a bug.

Overall the Culmination support Gem is heavily bugged and should be thoroughly looked into.

Thank you.