Yeah, i am having the same problem. It happens if i load a game/vessel with a kerbal inside the pod. The portrait returns if you switch to another vessel within physics range, and then switch back again.
It does not return if you switch to a vessel through the map view, or if you save and reload the game.
When i load the vessel i sometimes see a single frame with the uninflated pod, which might be related.
My current workaround is to only save the game with the kerbal outside the craft.