About squid ink purchased from a wandering merchant

Briefly describe the bug here]
About squid ink purchased from a wandering merchant
Steps to Reproduce:
[Step 1] About squid ink purchased from a wandering merchant
[Step 2] Purchased again from the first wandering merchant and other wandering merchants
[Step 3]
Observed Results:
[Describe what happens]
1.Two items with the same name, but do not overlap
2.Items cannot be created even with this item
Expected Results:
[Describe what should happen]
Same items must overlap
(bood and quill,Black terracotta)Should proceed without problems with the combination