I recorded a drone and it disappeared from the video!

I recorded a drone and it disappeared from the video!
Time: 2:19 pm

Location: San Marcos, Texas

Time: 2:19 pm

Location: San Marcos, Texas

Can somebody help me exlain this? I saw a drone/plane. Weirdest looking drone, soon as i began to record, i followed it through the trees till the end of video. I was following looking at the white spec in between the branches directly from the screen, visible both to the naked eye and on the screen. When i replayed the recording, the drone disappeared in the recording soon as it hits off frame. This is insane! It just poofed out the video, and im scratching my head how its possible? Device is Galaxy S24 Ultra. Recording at 60 fps, 4k.