if you fall on the Slime Block from any distance while holding the jump key (default: Space), the slime block will not launch you in the air & will jump like normal (or higher if you have Jump Boost).
I do not know if this is intentional.
I do not know a lot about Java, but I think a fix for this would be kinda complicated, as the game would have to ignore the jump key being held only if the player has fallen more than their jump height can take them (so they can jump without interruption if they jump from one block bellow the Slime block). the game would also have to take into account the level of jump boost the player has or any extra jump height added by items in mods (since the Modding API is something the developers are working towards)
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megascience
I thought this might have been an intentional way to prevent obnoxious jumping when using this as a landing pad. While this has recreational uses, it can be used other ways which might be difficult if you are forced to bounce every time. But that's up to the developers and logically stated public opinion to dictate.
migrated
Is this still a concern in the current Minecraft version 14w18a / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
marcono1234
Confirmed in 14w21b
galaxy_2alex
Confirmed, probably intended.
migrated
Confirmed for 1.8 pre-3 but possibly WAI as it is insanely useful.
Erik Broes
I also noticed this occurs; it happens with me too, every time. Same goes for sprint-jumping. My guess is that Minecraft calculates that the player jumps before it calculates the slime block, so the slime block doesn't happen if the player is moving upwards, that's clearly wrong.