When I was casually playing Minecraft I decided to make a customizable shield banner, but then while I was in survival mode I couldn't create it and it was the correct recipe, so while I was in survival I turned into creative that didn't work, I search on google it Why can't I create a banner in Minecraft and I found a link in reddit saying that they can't create custom dyed banners.
MC-154886
Why are the banner no longer working
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You're doing it wrong, the 1.14 update introduced the loom, which is the new way to craft banners, making the crafting table obsolete in this function. This isn't a bug.