[MC-64070] Changing difficulty from peaceful may cause inaccurate hunger bars on multiplayer servers

The bug

Changing difficulty from peaceful to easy/normal/hard may cause inaccurate hunger bars on multiplayer servers.

How to reproduce

You're player A. Create a world and change difficulty to peaceful.
Open to LAN and have another player join. They're player B.
Change difficulty to normal.
Do this command:
```
/effect give @a hunger 10 100
```

Player A's hunger bar will work as intended, but player B's hunger bar will regenerate haunches during and after the effect. This is purely visual, as they will starve to death. Every tick of starvation damage will reset the hunger to its correct value, but it will continue to visually regenerate in-between those damage ticks.

Linked issues

is duplicated by 3

MC-64507 Hunger Glitch Resolved

MC-66405 Hunger Bar Acts weirdly Resolved

MC-66553 Hunger bars goes up automatically when change difficulty from peacefull to normal in a minecraft server. Resolved

relates to 1

MC-65869 Hunger bar rapidly depleting and regenerating Resolved

Comments 24

Mog (Ryan Holtz) 2014-07-30T13:57:52Z

If you're playing on peaceful, this behavior is working as intended.

Ryan Pinski 2014-07-30T15:18:35Z

It's on normal.

fdagpigj 2014-08-21T16:11:22Z

I've seen this happen, too. And themogminer, if he were on peaceful, his health should've regenerated.

Brian McNamara 2014-09-08T20:45:44Z

Here is more video evidence of it happening in 1.8: https://www.youtube.com/watch?v=0IgyfRh15kE&t=10m45s

trazlander 2014-09-30T07:57:17Z

Here's another video of it that my friend made back on July 23rd http://youtu.be/7aYeyXRYybc, so it definitely started happening in Snapshots 14w30a/b/c or earlier.

14 more comments

gerrybrano 2014-10-14T16:13:33Z

This bug is a multiplayer issue only. It happens when the server is set to peaceful difficulty before a player joins and then gets set to something other than peaceful, after. The client seems to not get updated by the server of the change. If you check your difficulty in the options menu when you first join, it will correspond to the current difficulty of the server and does not update when you change the difficulty through the console. As a result the client renders the hunger as if it was still in peaceful, causing it to always refill. However, your hunger value is actually still going down. If the player re-logs after experiencing this, their hunger will display its proper value, the hunger bar will act as it should, and the difficulty setting in the options menu will show the correct difficulty.

Brian McNamara 2014-10-23T00:04:57Z

Confirmed for 1.8.1-pre2.

Brian McNamara 2014-10-23T00:13:59Z

I should note that this affects gameplay; if the client thinks you're full, you can't eat, so you end up with players who cannot sprint or are starving, but also cannot eat any food.

trazlander 2014-11-20T11:22:44Z

Does anyone know the exact steps to reproduce this?

gerrybrano 2014-11-24T21:49:12Z

Yes, TrazLander. See my comment above.

Jackalmen 2015-04-11T08:51:21Z

I can confirm that this happens as well.

Brian McNamara 2015-11-12T17:02:18Z

Still occurs in 15w46a

Ridge 2015-12-29T20:00:37Z

Seems to be confirmed on 1.8.9 server after changing from Peaceful to Easy. No indication of food loss and then suddenly starving, then once you hit 5 hearts (from starvation on Easy) and the food bar is refilled, you have to take more damage to eat (regardless of what amount, it'll just refill the bar quickly like before) and only then will your bar actually be full and you can regenerate hearts.

Will add I'm using minecraft-server1.8.9 exe to run the server (so not LAN)

SunCat 2016-02-13T15:58:44Z

I think this is a dupe of MC-65869, or comments are just mixed up.

wobst.michael 2016-10-22T18:46:38Z

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.

Meri Diana 2017-12-13T16:30:27Z

~~I'd also like to know if this still happens, as this bug was considered a "must-fix" by some mapmakers, and I don't have the time to reproduce them all~~ 🙂 ~~Thank you.~~

Thank you gerry 🙂

gerrybrano 2017-12-18T02:42:27Z

Still occurs in 17w50a.

husky2490 2018-01-12T21:32:35Z

If this is not the right place, please point me to where I should go.

I recently started a multiplayer server and everything worked fine until I restarted it. Now my client is stuck in peaceful difficulty even though the server is on normal difficulty (I have done /difficulty 2, I can see wild wolves wandering around my temporary base, and creepers show up in commands). I am pretty certain it's the client because in the settings there is a greyed-out "Difficulty: Peaceful".
~~How do I fix?~~
Edit: Relogging fixed it. Would setting the difficulty to peaceful in the server properties file when creating the world, then setting the difficulty later with commands cause this?

gerrybrano 2018-01-12T23:27:06Z

Yes husky2490. Read my first comment.

Paint 2018-08-14T20:50:52Z

Confirmed for 18w32a.

This ticket needs Reproduction steps. Here's what I would write:

—

You're Player A. Create a world and change difficulty to peaceful.
Open to LAN and have another player join. They're Player B.
Change difficulty to normal.
Do this command:
```
effect give @a hunger 10 100
```

Player A's hunger bar will work as intended, but Player B's hunger bar will regenerate haunches during and after the effect. This is purely visual, as they will starve to death. Every tick of starvation damage will reset the hunger to its correct value, but it will continue to visually regenerate inbetween those damage ticks.

—

This ticket's affected versions also keeps to be kept updated, I'd be ok with being the reporter.

Paint 2018-08-15T17:18:45Z

Confirmed for 18w33a

SirSqueaksAlot 2020-10-19T08:39:51Z

here 2 years later unfortunately, accidentally reproduced this bug on 1.16.3

easiest fix is to restart server

Andrew Ramirez 2020-12-10T05:11:18Z

what if this is happening to me but im not on a server

rkullenius 2024-12-03T13:59:07Z

Can you confirm you can reproduce this issue on the latest version?