The trade button cannot be used with addon items.

The trade button cannot be used with addon items. Items from the addon cannot be traded with buttons, and on mobile platforms they cannot be exchanged in any way. Only vanilla items can be traded.

Video:
https://drive.google.com/file/d/1658TuNURrHnsSbrbDwITfn6GOYttAla9/view?usp=sharing

Items version: 1.21.10 and have customs component