System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 462.59

Blender Version
Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: rB84da05a8b806
Worked: Maybe 2.91?

Short description of error

• Regression: Adding a speed strip(in stretch, multiply: 1), doesn't play at 100% as initial value.

• Changing the in handle should not change the out value in stretch(multiply: 1):

(Earlier attempt to fix this, but unsuccessfully: https://developer.blender.org/T45191)

• Multiply should not have any effect when in stretch:

The regression bugs seems to be related to this patch: https://developer.blender.org/rB93c10797dc35e17bbd96f3711a151acf2d184848

Please consider reviewing and comiting this patch, which will clean up and make it transparent, what is actually happening, when working with the Speed strip options: https://developer.blender.org/D6110

A video file with values going from zero to 1000, for testing: