When finish exporting the Video, in the gallery, we have 2 videos but can’t open them.

[telberiaarbeit]

Hi, pls help me with this issue I'm facing: When finish exporting the Video, in the gallery, I have 2 videos but can’t open them. I use Android 11.
Video about it:
https://drive.google.com/file/d/1TT6rFYF6iXw_5ivnbci40VcAV27gU9UX/view?usp=sharing