During the conversion of GPv3 to GPv2, we computed the
time difference between the points. So we we're keeping track
of the time a point was created relative to the previous point.
There doesn't seem to be a good reason to do this.
It can also go very wrong in case the times of two points are
very close to one another (which can result in catastrophic
cancellation).
With this change, the time delta values are now the time
a point was created, relative to the first point.
Pull Request: https://projects.blender.org/blender/blender/pulls/122367
94b4542afe