So I was playing with the banners and I wanted to move a banner. It wasn't in my inventory and I was in creative mode, and I didn't want to re-create the banner. I middle clicked the banner and then it gave me a black banner instead of the banner in front of me.

Steps to Reproduce:
1. place any banner down in creative
2. middle click the banner or whatever button you use for pick block
3. you get a black banner

Picture: what happened after i middle clicked