Create a custom banners using a loom (try making it as complex as possible), add it to a shield and save it in a hotbar, then, change your game to a higher version. The banner on the shield doesn't load properly and lowers its resolution.
Expected result: The shield displais the original banner
Observed results: The shield shows a lower resolution version of the original banner.
This can affect any world or version in witch you can obtain a customized shield from a hotbar save.
Please update the description to include steps to reproduce this issue, as well as expected VS observed results.
Please also attach any needed commands, datapacks, resourcepacks, screenshots, videos or worlds needed to help reproduce this issue.