Well... the title is explict enough...
When I tried to place a blank banner, no matter the main color, the banner isn't showing... It applies for hanged banners on a wall and banners planted on the ground.
While a decorated banner seems to get shown...
UPDATE: According to the video I send, it disappers only when it's placed. But when I reloged inside my world, the "previously invisible banner" reappeared.
Thank you for your report!
We're tracking this issue in MC-236632, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki