How to reproduce:
1. Open user's attached "AnimatorBlendingTest2019.zip" project
2. Open "test" Scene
3. Open TestAnimatorController in the Animator window
4. Make sure parameters are visible in the Animator window
5. Make sure that Animator window would be visible during Play Mode
6. Enter Play Mode
7. Observe the parameters and transitions in the Animator window
8. Observe the GameObject in the Game view, which has "created at runtime" text written above it

Expected result: OnAnimatorMove changes GameObject's color when CurveValue is changed on the first animation (step 7)
Actual result: OnAnimatorMove changes GameObject's color on every animation even when CurveValue is not changed (step 7)

Reproducible with: 2018.1.0b10, 2018.4.23f1, 2019.4.2f1, 2020.1.0b13, 2020.2.0a15
Not reproducible with: 2018.1.0b9

Notes:
- AnimatorController and AnimatorOverrideController, which are created in the Editor doesn't produce any glitches
- Attached a video for reference in edit