When you have an untamed wolf on a lead in survival they will go into their aggressive mode around certain mobs and the lead will stretch as they chase them around (far past what the leads limits are normally). When they kill the mob or it despawns, the wolf will return to normal and then the lead will snap because they are out of the limits of the lead.
MCPE-238000
Untamed wolves on a lead will not be affected by the lead if in their aggressive mode
Resolved
Duplicate
0
We're tracking this issue at MCPE-234428, so I will resolve and link this report as a duplicate.
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