Pedal-symbols are not working as expected

If I extend the line of a pedal symbol often the pedal symbol disappear. Please look to the attached video.
Pedal (1.09 MB)

I can’t reproduce this in a new project in which I’ve input the same music as you show in your video. I will need to see your project file to diagnose the problem. Please zip it up and attach it here.

I sent you an email with the project.