Extending filter before start position corrupts keyframes position, causing inconsistency

Bug
1

  • What is your operating system?

    Windows 11

  • What is your Shotcut version (see Help > About Shotcut)?

    26.2.26

  • Can you repeat the problem? If so, what are the steps?

    1. Extend the filter before the start position.
    2. The last keyframe’s position is corrupted, inconsistent with the actual position. Sometimes other keyframes and even interpolation frames may also be affected.