Chainsword Attack Pattern - Mystery Heavy Attack

Warhammer 40,000: Darktide Bugs
1

Issue Description:
The 1h Chainsword has a strange attack chain and heavy attack that occurs after light 1 and light 3.

Steps to Reproduce:

  1. Equip 1h Chainsword
  2. Entire any mission or Psykhanium
  3. Do this pattern - light, heavy, light, heavy, repeat
  4. Note the attack pattern - it appears to go light 1, heavy 2, light 3, heavy (?), which chains back into light 1

Mission Name (If Applicable):
N/A

Platform:
Steam

Player ID:
[Steam ID]

Reproduction Rate:
Constant (100%)

Upload Supporting Evidence:

2

If this isn’t a bug, then why isn’t the third heavy attack listed anywhere, any why isn’t it possible to chain to it from one of the other heavy attacks?