Previously, Mining Fatigue status effects of high levels would make the player unable to break any block. Now, it is possible to break instamine blocks.
How to reproduce:
1. Create a super flat survival world with cheats (redstone ready).
2. /give @p torch
3. /effect @p minecraft:mining_fatigue 100 4
4. place the torch on the ground.
5. attempt to mine the torch. It will break.
Related issues
is duplicated by
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Not a dupe. Don't get why these mistakes are always made.

ikr

Potion effects beyond level 4 are not supported.

Firstly, they should be. Mapmakers use them a ton. Secondly, Mining Fatigue of exactly level 4 (Display level 5) works exactly like mining fatigue of higher levels.

Firstly, they should be.
For feature suggestions or changes please see: Minecraft Suggestions on Reddit.
Secondly, Mining Fatigue of exactly level 4 (Display level 5) works exactly like mining fatigue of higher levels.
You mean this ticket should be: Mining fatigue amplifier 4 allow instamine items to be broken or how do you mean that ?

Yep. Pretty much.

Confirmed and updated description to keep the amplifier in the "valid" range

Update: According to the wiki, this is intended. See http://minecraft.gamepedia.com/Status_effect
the behaviour was changed in 14w25a such that mining fatigue is no longer a linear 20% decrease.

Interesting. I think the resolution is "works as Intended". why invalid?
EDIT: thanks.

Whoops, I was thinking of MC-10755. Fixed now.
This is NOT a duplicate of MC-10755. That bug is a blanket bug that was dismissed a long time ago. This bug refers to a specific issue with mining fatigue.