I have a shulker box full of filled, level 0 maps, and seemingly at random some of the maps become "unknown map" (all of the filled in data and the location (position in the world) of the map remain unchanged though). And this doesn't affect all maps, only some are changed. Everything is set back to normal after taking the unknown map out of the shulker box and placing it in the inventory.
EDIT: Seems to affect all container blocks as well, when placed. If the map is in the player's inventory or in an item frame, then the issue isn't present. The maps becoming unknown map only happens when relogging as well. Even ender chests, which have storage exclusive to each player, are affected.
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How exactly is this a duplicate if the other report was made almost a year later than this one? That isn't how duplicates are supposed to be handled. A duplicate is a report that is made when one already exists, making the other report the duplicate, not this one. I've seen a lot of other false/wrong resolutions used by the moderators and Mojang before, and it seems like things are handled very arbitrarily here without any apparent reason or explanation.

because that ticket is more detailed and there's no reason to copy the description when it's already done and you can just forward resolve the older ticket
it's not important to keep the "duplicates are older" connection, it's more important for tickets to be descriptive of the bug
Thank you for your report!
However, this issue is a Duplicate of MC-157590.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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