leads disappear when exiting the game
steps to reproduce
attach a lead to a mob
open the menu
select "save and Quit to Title"
reload the world
If you do this the mob will not be attached to you when the world reloads and the lead will not be in your inventory or on the ground
Thank you for your report!
We're already tracking this issue at MC-14826, so I will resolve and link this ticket as a duplicate.
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