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MC-46345

Maps stop updating after going through nether portal / Map update packets ignored by client

On servers, maps will stop updating after they have been in hell. You don't have to have opened them, they could have just been in your inventory. When you resurface to the over-world, the map will have froze and so will your marker. The only way to have the map update again, is to re-log.
As you can see, I am standing on a platform where I can AFK for better drop rates on my mob farm(photo1). The map is working but as I enter and leave the nether, (photos1&2) the map still currently says I'm at that position (photo3). Until I have just re-logged, it only works (photo4) This was done in a private 14w04b server. This bug is affecting me in a severe way, due to the fact that my computer is old, and takes forever for me to actually log in.


Mod edit: Added description of MC-79225 :
There are some unresolved and/or abandoned bugs for this issue. I was doing a bit of programming using map packets, and eventually found out that the client ignores map update packets once the dimension has been changed.

The easiest way to reproduce (singleplayer or multiplayer):

  • Create a map for your current area

  • Create a nether portal

  • Go in the nether portal and then return back

  • Notice your map no longer updates

Any update packets sent that corresponds with the damage value that corresponds with the map created at the start of the above process is ignored after dimensions are changed.

Logging out and logging back in (or quitting to title on singleplayer) fixes the issue, but is a poor temporary fix.

Also, it's worth noting that every single map ID that the player has handled packets for will no longer update, not just the single packet in the current area.

Notes:

  • You do not need to bring any maps with you into the nether to trigger this bug.

  • When the dimension is changed, the map's canvas is cleared on the client's side to all zero pixel values (impossible without modding the server).

  • Once the map is updated with any packet that corresponds to its ID, the client displays the last data from when it originally worked (before dimension change), and will not change, and will not show any data from any new incoming packets.


Code analysis: https://bugs.mojang.com/browse/MC-46345?focusedCommentId=295843&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-295843

Linked issues

MC-48129 Buggy Maps Resolved MC-49459 Map bug Resolved MC-68550 Map shows old location after traveling via Nether Resolved MC-70133 Player marker on map stops following player Resolved MC-70725 Player location on map does not update upon exiting Nether portal Resolved

Attachments

Comments 48

I can confirm. It doesn't update block changes, nor show player movement.

Oktay Yildirim

I confirm. It happened to me many times. Very annoying. PLEASE FIX!!

It doesn't update even after they've been to the End. But it fixes also itself after reloging.

Clément Vuchener

It happened to me with 14w30c. It can be easily reproduced in creative mode.

Still happening in 14w30c. I forgot about this bug, went through the nether and map not working. /stop and then restarting the server fixed it. But that is not a good solution if other people are online

38 more comments

Confirmed for 1.10 😞

confirmed in 1.10.2.
Im even having the issue that any maps in the WORLD freeze, even ones in chests,item frames, or ender chests. Not just held in my inventory. And these maps are not updatable even after relogging\restarting in singleplayer.

@unknown

Affects Version/s: ......Minecraft 1.10.2

Already marked as affected, please look if it's listed already before confirming it.

Confirmed, still broken in 16w40a. This does not only affect multiplayer but single player as well. Leaving server/world and going back in will reset the maps so they will show your position once again.

MC-46345 was marked as fixed, if this is actually the case (no version released yet) this should fix MC-80782 and MC-98707 too.
If MC-46345 somehow does not fix the other two the severity of the memoryleak may increase greatly.

Kyle Perry

Agnes Larsson

Confirmed

Minecraft 14w04b, Minecraft 1.7.10, Minecraft 14w30c, Minecraft 1.8-pre2, Minecraft 1.8-pre3, ..., Minecraft 16w33a, Minecraft 16w36a, Minecraft 16w38a, Minecraft 16w39c, Minecraft 16w40a

Minecraft 16w42a

Retrieved