Impart Base Velocity CharacterMovement component frame rate dependecy

Hey. Found strange behavior of calculating base Velocity in CharacterMovement with a frame rate less than 30
The lower the frame rate, the more our base speed that the character inherits grows. In such a setup with a platform, when jumping on a platform the character will jump much higher at 15 fps than at 30 fps.

FPS 45 Base speed 400
FPS 30 Base speed 400
FPS 20 Base speed 600
FPS 15 Base speed 800

Is it a bug or some feature of CharacterMovement component?