Lead becomes invisible after detaching from trader's llama

Wandering trader spawns with 2 llamas holding them on lead.

If I right click on one of the llamas with a lead, it will attached to it, however the trader still holds the llama, so I can't pull it. That's OK.

When I right click again to detach the lead, the lead becomes invisible in my hand. When I place an other item to that slot, it suddenly becomes visible.

Steps to reproduce:

1. Find a trader with llamas (I dug a hole below him to stand still)

2. First day there is a visible lead on llamas, that trader holds, so you can't attach a lead to the llama

3. However the next day after sleeping, this lead disappear, so you can attach your lead to the llama
   

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4. Detach the lead and it becomes invisible
   

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5. Seeking in the inventory it's still invisible
   

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6. However if I place another thing to that slot, it becomes visible again
   

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