Operating system: Debian 10
Graphics card: Radeon HD 7950 + GeForce GTX 1060
Short description of error
In the VSE, when creating a transform strip and animating some properties (tested with opacity, scale, offset, rotation), and then reassigning it to a different source, the keyframes are not moving along the transform strip itself.
Exact steps for others to reproduce the error
Based on this .blend file, reassign the transform strip to the second strip. I'd expect the keyframes to be offset along with the transform strip, but they don't.