Splitting clip with a keyframed transform silently drops the transform

[mgree]

• Operating System: Debian Linux (testing)
• Shotcut Version: 26.4.30+ds-2

Describe the bug
A clear and concise description of what the bug is.

Steps To Reproduce

1. Start Shotcut
2. Load a video
3. Zoom the video, using keyframes to time the zoom
4. Split the clip

Expected behavior
Transform splits appropriately, creating keyframes for the interpolated position on either side.

Actual behavior
Transform stops applying, video is in original state.