After switching between the Experimental and normal worlds, spam is displayed in the console.
The issue is more or less the same as MC-249007, but the issue is currently generated by the game's built-in data packs.
Game output
01:12:15.191
Not all defined tags for registry ResourceKey[minecraft:root / minecraft:item] are present in data pack: minecraft:bookshelf_books, minecraft:hanging_signs
01:12:15.191
Not all defined tags for registry ResourceKey[minecraft:root / minecraft:block] are present in data pack: minecraft:all_hanging_signs, minecraft:ceiling_hanging_signs, minecraft:wall_hanging_signsLinked issues
duplicates 1
Comments 2
Thank you for your report!
We're tracking this issue in MC-249007, so this ticket is being resolved and linked as a duplicate.
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It's exactly the same as the linked report, and this should be closed as duplicate and the steps to reproducevadded to said report, as is always done in other cases too. New reproduction steps have never been the base for allowing a new report for the exact same bug, when it has not even attempted to be fixed.