message variable doesn't work with JSON message mechanic

Mythic Mobs Version: v4.1.0 (Build 1993)
Server Version: 1.11.2

In the newest development build there is an issue with the <mob.uuid> variable. Essentially when used in the JSON message mechanic for a click event using /mm signal <mob.uuid> <Signal>, it will not work. It will simply return an error message. This one is set to Investigating because I'm not 100% sure if this an error on my part.

To replicate use the JSON message mechanic and go for a click event. Set the click event to...

<mob.uuid> message variable doesn't work with JSON message mechanic