Steps to reproduce:
1. Download and open the latest attached project
2. Enter playmode
3. Set Mode 2 to true
4. Hold SpaceBar to continuously set velocity to 10

Expected result: once it reaches a block, it will not go to sleep until physics changes are no longer applied
Actual result: it will sometimes flicker to sleep state even though physics changes are being applied

Reproduced on 2017.4.4f1, 2018.1.0f2, 2018.2.0b6, 2018.3.0a1

Verified FIXED 2018.3.0a5

Notes:
-Project is set to timeToSleep = 0.1 to accentuate the problem, but can occur on default settings as well.