Can't substitute Hill giant slayer assignment with Cyclopes

[RiL]

What did you do?
Attempted to kill Cyclopes while having a Hill giant Slayer assignment.

What happened?
No progress was made towards the assignment.

What did you expect to happen? (Provide a source from runescape wiki/youtube/etc if possible)
That the slay counter for Hill giants would decrement.
Source: https://runescape.wiki/w/Hill_giant?oldid=886112

Are there any relevant item/npc IDs? (use ::debug command in chat)
Hill giant IDs: 117, 4689, 4690, 4691, 4692, 4693.
Cyclops IDs: 116, 4291, 4292, 6078, 6079, 6080, 6081, 6269, 6270.

Notably, they all have the same slayer_task id: 44.

Have you reproduced it on the test server? If so, what are the steps?
Only on single player.

[Ceikry]

Notably, they all have the same slayer_task id

This isn't and has never actually been used for slayer. There's an open issue on gitlab to remove it from the configs: https://gitlab.com/2009scape/2009scape/-/issues/466

[RiL]

Alright. But it's probably indicative of that it is intended for Hill giants and Cyclops to be the same slayer task.

[Ceikry]

Yup, I was mostly leaving the comment so contributors don't fall down a rabbit hole that leads to the incorrect solution