Why Play Animation stoped in Video Editing after 1 second?


I am using Blender 2.93 in Debian Linux. I am using Video Editing Workspace.

If i put to timeline videofile and push Space (or click Play Animation button at bottom timeline), the video playing only 1 second and stop. WTF?

But if play animation backward with nearest button, the video correct backward playing.

Question: how to play video in Blender 2.93 in Video Editing Workspace?

The animation range isn’t set to video lenght, because it’s not a pure video editor, it’s a 3D-Animation SW where you have to set your wanted range (250 frames as default, so wondering why 1 second? also debian ).