When in creative mode, jumping sometimes places you in a strange state where you are flying but cannot go upwards. When you actually fly on purpose, this issue persists - only when you try to go up, the game seems to think you're jumping and forces you back down again. It's difficult to explain this glitch, but it makes the game unplayable in creative.
In spectator mode, you can rise but you do so very slowly as you seem to stop every few seconds. Please fix this