I believe it's not classed as jumping, since the Guardian is frantically bouncing around and isn't intentionally "Jumping" - Most mobs jump to go up 1 block heights. Where are the guardians movement is erratic and random.
ShowParticles
Option to show or hide all particles for a potion effect, while the 'Ambient' tag only shows fewer particles. Set to true to show, false to hide.
Was introduced in 14w06a
14w06b "Slimes can now swim as a result of the update to the new AI."
I believe this works as intended.
This was patched a long time ago, slimes can swim now.
I'll end up using the bottom piston elsewhere to block the path of the cave spiders. Thank you for your comment!
Alright, thanks! - I wasn't going crazy then.
Quote from minecraft.gamepedia.com/enchanting
"Does not increase vertical speed."
I duplicated this glitch and here is the crash report: