Under the decorations tab in the creative menu, banners show NBT:1 tag(s).
Advanced tool tips must be on; F3+h.
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Would the fact that banners have a default nbt tag invalidate MC-62975 since regular pick block does not give you the nbt of a block? Or there should at least be an exception for the Base tag on banners so you at least get the expected color of banner with regular pick block.
Your comment https://bugs.mojang.com/browse/MC-62975?focusedCommentId=197878&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-197878 speaks against invalidating MC-62975.
Banners have always the nbt tag
Base
(base colour) , see http://minecraft.gamepedia.com/Chunk_format (in opposite to other coloured blocks the banners encode the direction like signs in the meta data)See also MC-62975: You need to CTRL-pick-block to get the right base colour.