Java - 21w13a is a Version in Minecraft.
{ "id": "java-21-w-13-a", "type": "Version", "data": { "name": "Java - 21w13a", "Update-VERSIONS-Version": { "caves-cliffs-part-i__Update-VERSIONS__java-21-w-13-a": true }, "Version-EDITION": { "java-21-w-13-a__Version-EDITION__java-edition": true }, "release_date": "2021-03-31", "Version-ADDED_CONTENT": { "java-21-w-13-a__Version-ADDED_CONTENT__dirt-block-tag": true, "java-21-w-13-a__Version-ADDED_CONTENT__snow-tag": true, "java-21-w-13-a__Version-ADDED_CONTENT__axolotl-hunt-targets": true, "java-21-w-13-a__Version-ADDED_CONTENT__freeze-hurts-extra-types": true, "java-21-w-13-a__Version-ADDED_CONTENT__freeze-immune-entity-types": true }, "Version-REMOVED_CONTENT": { "java-21-w-13-a__Version-REMOVED_CONTENT__axolotl-tempted-hostiles-removed": true } }, "updatedAt": 1651048714775 }