UNET Message Inheritance Broken

I am using messages, with child messages that contains additional bits of payload data in addition to the parent payload data. However, it does not seem that messages can handle a data payload split between parent and child. It does not throw errors, but the data does not get sent correctly.

My debug log reads this as being sent/recieved
MsgOut: KeyAudioClipIndex = 2 and Vec3=(2.4, 0.0, 1.1)
MsgIn: KeyAudioClipIndex = 0 and Vec3=(2.4, 0.0, 1.1)
***The...

UNET Message Inheritance Broken