WOW, that was totally weird. I had been shooting shots using the hardware camera button. Since I was trying anything to debug this problem, I decided to shoot a picture using the on screen button. Then I noticed the Pictures icon in the upper left corner was replaced with the moving circle icon. When the Pictures icon reappeared, I went to the Photos app and all my missing shots from the previous days started showing up in the Camera Roll folder where it should have been earlier. Now I can shoot with either the hardware or screen button and my images are showing up without issues. That was pretty strange. Just reporting in for filing in the WTF department.