๐ฆ๐ถ๐น๐ธ ๐ง๐ผ๐๐ฐ๐ต ๐ฆ๐ฝ๐ฎ๐๐ป๐ฒ๐ฟ๐ [1.21.30+]
Break the mob spawner with a pickaxe enchanted with Silk Touch, and it will drop! Now you can take it with you and place it wherever you want! The mob inside will be preserved!