Operating system: Linux-5.4.0-65-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.102.04
Broken: version: 2.92.0 Beta, branch: master, commit date: 2021-01-31 13:31, hash: rBa9b53daf23ba
Worked: (newest version of Blender that worked as expected)
Short description of error
when having two keyframes and setting the interpolation of the first one to elastic the curve always goes down on the Y- Axis first.
This leads to having to add another keyframe like this:
Maybe I am missing something and this is not a bug, but setting the Amplitude of the elastic interpolation to a negative value is where I would flip that behaviour, but the amplitude is limited to positive values only. Allowing negative values for the amplitude would fix this.
Exact steps for others to reproduce the error
Add 2 keyframes to cube, set interpolation of the first keframe to elastic, try to flip the elastic curve to start upwards bound on the Y-Axis...