Painting on animation sequence paints on invisible T-pose skeleton

REPRO STEPS:

1. Open QAGame in the editor
2. Search for Crouch_Idle_Rifle_Ironsights and drag it into the level
3. In the Modes panel change to Paint (SHIFT+2)
4. Set the Brush Radius to 140
5. Select Crouch_Idle_Rifle_Ironsights in the level and hover the paint brush over it

RESULT:
A highlight for which verts you will be painting is visible, and shows the skeleton in T-pose instead of the crouched pose. When painting, the paint goes onto the part of the skeleton represented in the T-pose - so if you paint in the area of the crouched skeleton's head, it will actually paint on the skeleton's middle as this is where the middle of the T-pose skeleton is.
Screenshot attached for clarity.