[MC-304864] Leads between tethered mobs can eventually snap when the mobs are each in a loaded and unloaded chunk

If a player leashes two mobs together then waits some time with the mobs on the edge of their loaded chunks, the lead will eventually break.

Observed Results:

Tethered mobs become detached, presumably due to differences in whether they are loaded or not.

Expected Results:

Tethered mobs stay tethered at all times, unless caused to untether by a player or death of either mob.

Linked issues

relates to 1

MC-300654 Leads stretching across a chunk border can break when the player dies or otherwise unloads and reloads the chunks quickly Reopened

Attachments

Comments 3

[MCQA] Blawik 2025-12-08T14:00:00Z

Hi!
Thank you for your report!

However, this issue has been temporarily closed as Awaiting Response.

Could you please provide more details or/and media files. As we have no repro of this issue.

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This ticket will automatically reopen when you reply. Thanks!

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Entityyy 2025-12-09T00:11:10Z

I wouldn’t be sure how to reproduce this issue, I noticed it on a multiplayer server. I have two Allays leashed to a Sniffer (both of which have become unleashed before, but I saw there was already a report specifically about them) and I have an tamed, unsaddled Horse also leashed to the same Sniffer as I sometimes AFK and want to keep it loaded.

Sometimes after some time of not being close to the mobs, I notice some distance between the Horse and Sniffer at a flat part of my base. I then head over and find that they’re no longer attached and sometimes there is a Lead item on the floor. (This happens when I am alone on the server, of which I am the only person with OP permissions, so I know it isn't somebody messing with me)

Entityyy 2025-12-09T04:00:55Z

I noticed the Horse detached and looked over at the Sniffer and saw this. (Approximately 4 chunks from where I took the screenshot, but it obviously could’ve occured at any time)

I froze server ticks to get closer ensuring it wouldn’t change, and enabled chunk borders

I then unfroze the server ticks to see if the connection point would snap back to the Sniffer but it didn’t

I once again froze server ticks as I went to retrieve a pair of shears from my chests (Which are ~12 chunks away) and came back to find the connection point had attached back to the Sniffer.