I took three frames from a short time-lapse video I made and put them together. Added the green arrows to indicate a point in the pictures.

I am not sure what I got here. I was making a short time-lapse video of the constelations of Scorpius, Sagittarius and the Teapot trying to capture the Milky Way. Then suddenly I saw a bright point like a star. There was nothing there, then this bright object appeared and in the same way it appeared it disappeared. When I reviewed the time-lapse video it was recorded in there.
I do not know what it is. I need your help to try to identify what it was.
I have the time-lapse video if reviewing it may be needed.
Thank you.