[Ya Boy Cy]

The Bug: Combat Dummy not deploying when used in a camp.

The Process: 
1. Set up a camp.
2. Set up a campfire with the kit.
3. Via the 'U' hotkey, Inventory menu, or the Tool belt, use the Combat Dummy.

The Result:
A system message pops up, stating that you've used the Combat Dummy but it doesn't appear anywhere on the map and it is consumed.

Update
I purchased a Soft and Hard Combat Dummy from the Militia NPC in the Tannis Water...house, thing. These deployed with no problem whatsoever! I'm under the impression this only seems to apply to the Combat Dummy one can craft with Level 2 Woodworking.

I hope this helps, please let me know if more details are needed. I only decided to make a forum post after trying to replicate the issue at least three times.

[Neus]

I believe this is an error on my part as the base combat dummy was not set up to be used. In any case, I've removed it from the crafting list.

If you made a bunch for some reason, you can ask a GM to swap them for Soft or Hard ones.