I was working with the vanilla behavior pack to modify the trades for a village and discovered that although you could placed the necessary code for the illager banner into the GIVE section of the code block, you cannot place the same code into the WANT section of the code and have it generate the image affect the trading block to accept the illager banner as a trade item. It only works for the give section.

The behavior of the code was such that the interface would accept ANY banner as well as the illager banner instead of specifically the illager banner. The UI also showed a white banner in the side bar where the trades are shown instead of the specified illager banner.

The necessary code to generate the illager banner was the same as what was used in the loot table for the Pillager Captain Equipment.

( due to code formatting issues, I have attached the code block as a screen capture as well as the interface output )

After checking with staff on the discord, it was suggested I submit this a a possible bug since the same code should in theory work on both sections.

Upon request, I can include a copy of the custom behavior pack.