When in no-clip mode (F2) hitting space bar twice freezes up flying up/dpwn

Partner Rank:
3 (it's more annoying than urgent!)

Verification Builds:
1.16.100 (4929535, W10)

Regression Builds: Worked prior to 1.16.100

Summary: When in no-clip mode hitting the space bar twice freezes up flying, enters some sort of locked-elevation mode.

Affects currently Live Content:
No

Impact: When using F2 (no clip mode) if you press space bar twice to ascend you enter some sort of weird elevation lock that can not be removed until you double-space bar again. When developing content jabbing the space bar with no-clip enabled is fairly normal for us - so we keep getting stuck in this mode.

Repro Steps: 

1. Open a world (any)
2. Go into creative mode and fly upward by holding space bar (as normal)
3. Press F2 to enter no clip
4. Fly around a little, jabbing space bar a number of times. At some point you will become stuck in the current elevation. The only way to exit this mode is to jab space bar twice more.

Observed Results: The client enters into some sort of locked-height/elevation mode.

Expected Results: Previous builds of the dev clients did not do this. Space bar should ascend irrespective of how many times spacebar is pressed.

Screenshots/Videos: No.