Extendable Maps
Minecraft changed explorer maps, buried treasure maps, and other map types so they can no longer be extended in a cartography table or with paper like normal filled maps.
This datapack restores that behavior by making #minecraft:extendable_maps contain the same maps as #minecraft:clonable_maps.
Extendable Maps is a free Minecraft Java mod. Compatible with Minecraft 26.3-snapshot-7, 26.3-snapshot-8, 26.3-snapshot-9. Downloaded 1 times (via Modrinth). Download it and open it directly in the game.