This one should be an easy explanation:
Basically whenever you change your game-mode to Creative if you're just wanting to build redstone or making new builds in your terrain/building designs with the new blocks added to 18w11a it's annoying that if you accidentally pressed the Ctrl Key you'll basically have a short time till stop moving and it goes instantly (Works in1.12 and Below).
Well this isn't the case for the new snapshot 18w11a you're actually stuck with it and it's hard to place down blocks or redstone circuits if you just slightly touch any W, A, S, and D keys but it does go away only when you land that's when it goes away. Couldn't get a screenshot of it since it won't do any good nor` do I have a video to record this issue just hope you take my words of this situation cause it's still easily self explained if you have been in that snapshot or it's old previous snapshots.