Mob heads aren't dropping

[alfredcort]

Description of Issue

Mobs aren't dropping their head, this is the first time I'm using CMI's built in head system. I've set headDrop:true in modules along with setting the dropchance: 100 for every mob, though no mobs are dropping their head whatsoever. Is there anywhere else I need to enable mobs dropping their head? I've checked the config.yml and there doesn't seem to be anything there. I'm also trying as an OP so it can't be a permission issue, can it? CustomHeads.yml: https://pastebin.com/uxbxDtdW

Version Information

CMI: 9.7.7.10 SqLite
CMILib: 1.5.2.2 
Server: Purpur(2349) 1.21.3-R0.1-SNAPSHOT+
CMI economy: Disabled CMI Chat: Enabled 
Modules -> 47 enabled 20 disabled: cuffed, hpBossBar, mirror, launchPad, tablist, moneyCheque, portals, portalCreation, noTarget, jail, nightSpeedup, damageControl, bossBarCompass, teleportWith, schedule, elevator, ranks, selection, votifier, namePlates

Errors

No response

Relevant Config Sections

No response

Relevant Plugins

No response

Agreements

• [X] My server is supported by CMI.
• [X] My version of CMI at the time of this report is up to date.
• [X] I have searched the github and asked around before making this report.

[alfredcort]

I discovered it, there's an option in Combat.yml that is disabled by default, right at the bottom of the file.