Breaking a decorated pot causes it to drop all of the bricks and pottery sherds used to craft it, meaning it drops each of the angler pottery sherds that were used to craft it.
The player now gets the advancement "Respecting the remnants" when they brush a suspicious sand or a suspicious gravel to obtain a pottery sherd, and "Careful restoration" when they craft a decorated pot using 4 pottery sherds.
Datapack Codex — The all-versions Minecraft data pack reference. Community reference; not affiliated with Mojang Studios or Microsoft. “Minecraft” is a trademark of Mojang Synergies AB.
Primary syntax targets Minecraft Java Edition 1.21+ (singular folder names). Version-specific behaviour is flagged inline and mapped on the pack_format history page.