I splashed myself with weakness, left the world, entered agian, and after the weakness was gone, I still could not attack mobs without a weapon.
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Confirmed for 12.3 Windows 10, I used a splash potion of weakness on zombie villagers and got hit with it myself, now I can't hit anything at all, unless its a tool.

Confirmed on 0.13.1.

here I got another video for this: https://www.youtube.com/watch?v=jBOjDBf6CrI&feature=youtu.be
https://youtu.be/Dg-iRPgYHOk

Confirmed on Samsung Galaxy Note 5. Android 5.1.1 Version: 0.14.0 Beta 2

Confirmed on Samsung galaxy note 3 Android 5.0
MCPE 0.14.0 build 5
Still happening on 0.14.0 b6
I have reported this bug for test and fix. Unfortunately the fix will not be implemented in 0.14.0 but hopefully shortly after.

Thank god for that

Also confirmed for 0.13.2

Why can't the bug be fixed before 0.14.0? Isn't beta testing meant to fix bugs?

Be patient. Still many stuffs to do, they doing their best. Your comment is off-topic.

This bug has a effect on minecarts (all of them) and paintings too.
Now I need tools to break it...
Tested in Survival and creative
Latest tested version 0.14.0 build 7
Device Samsung Galaxy Note3 Android 5.0
The situation is slightly worse on the 0.14.0 update (Win 10) as using a strength potion doesn't undo the weakness effect as it did before.
This bug should be fixed in future release. (VSOBug 6780)

Confirmed for Samsung Galaxy Tab 4. Android 5.0.1. 0.14.0 - This can be quite frustrating when having to use a potion of strength to mask the effect temporarily when going into combat.

Damn it st8ll didnt fix only sword can use to attack mobs and animals.

Try using milk.

Affects 0.14.1 and 0.15.0 Realms builds.
@unknown Actually drinking milk doesn't fix the problem, I've tried. The effect is permanent!
WARNING to others: Giving yourself weakness will ruin your map and you won't be able to punch anything again until this bug is fixed!

I was able to remove the weakness effect in 0.15.0 realms build 2! Try splashing yourself with weakness and wait for it to wear off. If you haven't done this yet, then you're still permanently bugged with the weakness effect that prevents you from punching anything. For that reason I cannot close this report and fully say this has been fixed.

Another way to fix it is to drink a potion of Strength, wait for that to wear off and then that fixes it
Got another confirmation as fixed for 14.2
Could anyone else confirm?
@@unknown
Confirmed as fixed for me on 0.14.2 Windows 10 Edition
I just used a weakness potion on myself and after it wore off, I could hit with fists again.
(Also, drinking milk will once again remove the potion effects properly.)
I commented on the duplicate report, that using a strength potion can undo the effect of weakness that lasts. A temporary fix for the bug, but might get you out of a fix! 🙂