Primitive Enderdragon
Assigned
Reported
Comments
Still in 26.2 snapshot 1. Maybe it’s not a good idea to refresh the attribute and cooldown instantly. Instead, maybe a combat test feature is better: Swapping items refreshes the right attributes, but doesn’t reset attack cooldown (means real time but not percentage). So players won't feel that their swapping attack is too weak.
Swapping can combine attribute of item 1 and components of item 2 is absolutely broken. Datapacks or mods get the wrong result when detecting the used item. Also, marco can 100% successful and it’s not easy to detect on server because it’s same to “high-skill playing“ manually.
Even the third party server software, Paper, has made the fix plan for this bug by resting attack cooldown and refreshing attribute. However it’s not complete. The video shows that double swapping still has the spear reach and attribute (Some texture pack won’t affect the result). I guess it’s because the communication problems between server and client.
Still in 26.1 snapshot 7.
This mod can fix this bug. https://modrinth.com/mod/shieldsknockback/versions
If developer wants to remove the shield-knockback, why not add components for players to choose? It’s a really bad idea to transfer the knockback to the blocker and stopped by the shield-blocking-damage-tick.
This bug is not fixed in the current version 26.1-snapshot 5. We expect the ender dragon behaves like that in 1.9-1.13 version. Also the behavior on bedrock edition is same to java edition 1.9-1.13. However after 1.14 the ender dragon moves so slow on Y axis, so it perches so slow and can’t charges at the player (The explanation in MC-197201 is a little bit inaccurate but the bug exists).
This data pack fixes the problem (https://modrinth.com/datapack/dragon-movement-fix ), it just makes dragon’s y velocity much larger. Then I load this data pack on 26.1-snapshot 5. My conclusion is that the incorrect y velocity leads to these problem, and there is no more AI problems.
Firstly, I gave ender dragon a custom name to know the data pack is loaded successfully.
Video 1: The ender dragon charged to player like that in 1.9-1.13. Also the dragon can dive at player and then shot a fireball. So it solved MC-197201.
Video 2: The ender dragon perches like that in 1.9-1.13. So it solved MC-272431.
I agree with the previous comments, as it marked in the screenshot(屏幕截图 2025-12-31 164529), ydd * 0.1D is written as ydd * 0.01D and leads to these two problems. I don’t think there is any more bugs in file net/minecrat/world/entity/boss/ender/EnderDragon.class.
I’m so surprised that MC-102774 is fixed. So it’s time for MC-197201 and MC-272431.
This bug is not fixed in the current version 26.1-snapshot 5. We expect the ender dragon behaves like that in 1.9-1.13 version. Also the behavior on bedrock edition is same to java edition 1.9-1.13. However after 1.14 the ender dragon moves so slow on Y axis, so it perches so slow and can’t charges at the player (The explanation in MC-197201 is a little bit inaccurate but the bug exists).
This data pack fixes the problem (https://modrinth.com/datapack/dragon-movement-fix ), it just makes dragon’s y velocity much larger. Then I load this data pack on 26.1-snapshot 5. My conclusion is that the incorrect y velocity leads to these problem, and there is no more AI problems.
Firstly, I gave ender dragon a custom name to know the data pack is loaded successfully.
Video 1: The ender dragon charged to player like that in 1.9-1.13. So it solved MC-197201.
Video 2: The ender dragon perches like that in 1.9-1.13. So it solved MC-272431.
I agree with the previous comments, as it marked in the screenshot(屏幕截图 2025-12-31 164529), ydd * 0.1D is written as ydd * 0.01D and leads to these two problems. I don’t think there is any more bugs in file net/minecrat/world/entity/boss/ender/EnderDragon.class.
I’m so surprised that MC-102774 is fixed. So it’s time for MC-197201 and MC-272431.
Because of this bug, the refreshing of attributes always gets delayed, and the indicator also can’t recognize some different items. By the way, it can be confirmed in 1.21.11 rc-2, 1.21.11 rc-3, 26.1-snapshot 1, 26.1-snapshot 2.
0:00-0:13 Switching between two different items (same name but one has enchantment and the other don’t), the indicator will still keep recharging, and finally player can make a full charged attack. So why the indicator do not reset?
0:14-0:19 Switching between two items, for the next 2 ticks the indicator recharges at the speed of the first item rather than that player holds. This leads to the “shake“ of the indicator. So why it behaves that strange?
I believe some staffs have tried to fix it several months ago but maybe they encountered some difficulties. So this part of aged code is actually in a mess.
Can confirm in the current snapshot 26.1.
It won’t be noticed most of the time in vanilla game play. However, in datapack development, we need the area effective cloud that can offer instant damage effect for all the mobs whether they’re undead or not, but no status effect can achieve this and it brings so much inconvenience!
So I suggest MOJANG making dragon breath damage its own effect, just similar to the wither, it damages all the mobs including the undead mobs 3 * (2^levels) amount. And then make dragon breath cloud offer this effect instead of instant damage.
Can confirm in the current snapshot 26.1.
It won’t be noticed most of the time in vanilla game play. However, in datapack development, we need the area effective cloud that can offer instant damage effect for all the mobs whether they’re undead or not, but no status effect can achieve this and it brings so much inconvenience!
So I suggest MOJANG making dragon breath damage its own effect, just similar to the wither, it damages all the mobs including the undead mobs 3 * (2^levels) amount. And then make dragon breath cloud offer this effect instead of instant damage.
According to the comments below, this bug links to MC-272431. And it still exists in the current snapshot 26.1. In the file net/minecrat/world/entity/boss/EnderDragon.class, I found the code and marked it. 0.01 should be changed to 0.1
I used jd-gui-1.6.6.jar to open the current snapshot 26.1.jar. In the file net/minecrat/world/entity/boss/ender/EnderDragon.class, I found the code and marked it. So this bug can be confirmed in the newest version.
This bug may also leads to a strange attack. This attack can be named as the double swapping. This attack contains the attribute and cool down of the first weapon, then add the additional attack range of spear, and finally the enchantment of the third weapon.
Firstly wait the attack cool down completely, then stand 3-4.5 blocks away from the mob. Now player can only reach it through spear rather than sword.
tick 1: Switch to the spear (slot 8).
tick 2: Switch to slot 9 and attack at the same tick. In the first video slot 9 is a diamond sword with sharpness 4. In the second video slot 9 is hand.
In the first video, mob got a crit and lost 11.5 health. (Iron sword crit + Spear attack distance + sharpness 4 = 6*1.5 + 2.5 = 11.5). And only the diamond sword lost 1 durability.
In the second video, mob got a crit and lost 9.0 health. (Iron sword crit + Spear attack distance + Hand without enchantment = 6*1.5 + 0 = 9). And no weapon lost durability.
What is expected: Switching to spear and the third weapon leads the refresh of player’s attributes including the attack cool down, so the attack should be calculated as the 0% charged attack with the item in slot 9, and it will fail because player only has 3 blocks reach distance at this time.
In 26-1 snapshot, the enderdragon still behave like that after 1.14 version. So this bug DO EXIST in current snapshot. But I can’t find the code showed above in 26-1.jar. Can someone find the path of the class file containing these code?
This datapack can fix this bug: https://modrinth.com/datapack/dragon-movement-fix.
Can confirm in 1.21.11 rc-1.
Because of this bug, player can use spear to increase the attack range and decrease the cool down after a lunging from spear.
After 1.21.9, player can bind a slot and attack to the same button, so they can ALWAYS TRIGGER this bug. Not only for breach swapping of mace but also increasing attack range from spear that recently added.
Can confirm in 25w46a
Still not fixed
Can confirm that this bug is still in the newest snapshot 26.2-snapshot-3
Both efficiency 5 diamond pickaxe and no enchanted diamond shovel can’t mine grass block instantly. But switching the tool can make an efficiency 5 diamond shovel which mines the grass block instantly.