My first thought is the baker buried the bread out of shame for burning it, maybe they didnt want their parents to find out they just ruined some bread.
Anecdote from an archaeologist friend of mine: When she was a grad students she worked on a Pfahlbauer site (prehistoric dwellings from ~6000–1000 BCE) where lumps of organic material had been found in the 90s. After cursory analysis the lumps were presented as 'prehistoric bread' as there was evidence of different types of grain and even oats present. In the 2010s they created a likely recipe for 'ancient Pfahlbauer bread', curated an exhibition about experiemental archaeology, and partnered with local bakeries to sell breads based on the ancient recipe. Gaining a bit of media attention, they wanted to find out more about their samples. A closer round of analysis determined the lumps to likely be pieces of horse manure...
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[ 2.8 ms ] story [ 36.5 ms ] threadThe interesting part of the story is they've baked a replica (May 2025).. not discovered it (Sept 2024)
It never goes stale, as it's already concrete-like when it's fresh.
It's also the source of my favorite pun in Pratchett's vast wordplay production: the scone of stone, where dwarves royalty is coronated.
[0] https://wiki.lspace.org/Dwarf_Bread