Jeremy

This behavior still occurs in vanilla 1.21.1 when the AI is deactivated. This bug should be reopened.

Yeah this and the knockback from wind charges should both be changed. Blast Protection is supposed to protect against damage not negate any knockback taken. This is a huge oversight if unchanged.

Not fixed as of 1.21 Release.

I was able to reproduce in single player both with crossbow and dispenser in 24w18a in a fresh world (default simulation distance 12 chunks). I tried turning simulation distance down to the lowest setting (5 chunks) and it had no noticeable effect. Maybe there is something specific that triggers the bug for some in single player but not others.

Upon testing further it also does affect single player. Updated the bug report to reflect that.

Confirmed for 1.20.4

This could be working as intended.

This has practical survival applications like parkour courses where you intentionally hit armor stands/minecarts to boost yourself to a higher platform. To allow players practice this in creative mode would mean that this behavior should stay.

I can confirm that this is the case. To reproduce 1. Get a mace with Level 3 Wind Burst enchantment 2. Hit a mob with the mace knocking yourself over 4 blocks upwards. 3. Observe that the player takes fall damage.

I think this is a bug as mace hitting any mob is supposed to negate all fall damage, this bug prevents that.

Fixed in 23w35a

This is a seriously bad bug. I am surprised to see it still in the game after all this time.

Edit: You may also want to add that this affects Windows users as well, not just Linux.

You can fall on slimeblocks from any height and not take damage so fall damage is not expected to occur. That's what this bug is about.

I did some research into what could be causing this and think I found my answer. When you land, you're not landing on a slime block. When the piston is in the process of extending or retracting, what appears to be a slime block is actually Block 36, which doesn't have a collision box. So you fall right through it and land on the piston head. Then the slime block reappears (with you now inside it) and having just been extended, launches the player skyward.

Basically this amounts to an unfixable bug without reworking how pistons extend and retract.

I doubt this is intended. The player still jumps the same height as when a slimeblock normally launches that player. This bug applies to virtually all trampoline type designs. I see no reason why this behavior would be intended.

This is still an issue in 1.7.9 and launcher version 1.3.11.

This may or may not be an intended feature. Mojang has not yet stated publicly if this is intended or not.

This is definitely an intended feature.