After going into creative mode on a debug world and breaking any lectern that has a book in it will cause that lectern to reappear without a book.
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The same issue also affects signs. The rendering mechanism for signs is akin to that of books on lecterns, causing them to cease rendering at a distance and potentially exhibit rendering glitches. In a debug world, breaking a sign renders it invisible until you right-click it, although curiously, banners remain unaffected. It may be necessary to file a separate report specifically addressing signs. Similarly, enchanting tables exhibit the same behavior, with the book disappearing upon breakage until right-clicked.
Enchanting table:
/execute in minecraft:overworld run tp @s 89.95 71.00 21.42 214.89 49.41It seems that signs are not reliably affected by this issue.
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Block_master_80
When you right-click the lectern, it triggers the has_book state to be set to true once more, accompanied by a hand animation. However, if you're sneaking while holding an item and perform a right-click action, you can make the book reappear without triggering the hand animation. To teleport to the lectern, use the following command:
Please note that the lectern's position might change if Mojang introduces more blocks, as is typical in debug worlds. This might be connected to the resolution of MC-141934, but it's not entirely certain.