In my survival world I was about to go into the Nether, when I noticed the banners were completely white behind it. So, I exited the Nether Portal and the banners returned to their original state. Attached are a pair of screenshots.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-165252, so I resolved and linked this ticket 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 in the future to see if the issue has already been reported.
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