When flying in creative mode, movement using the WASD and SPACE (up) controls stop the player when the key is no longer pressed, regardless of any other settings enabled in the game. Flying down using the SNEAK key, however is dependent upon the sneak toggle setting. This is inconsistent with other modes of movement. These two functions should, ideally, be mapped to separate keys.
Thank you for your report!
We're actually already tracking this issue in MC-163025, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the [search feature|https://bugs.mojang.com/issues/
] in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki