In other words, the new version binds the container according to the name, not the ID, so I just need to add a new name to bind?
<lootcontainer id="220" name="junk_items" count="0,2" size="4,3" sound_open="UseActions/open_backpack" sound_close="UseActions/close_backpack" open_time="1.5" loot_quality_template="qualBaseTemplate">
<append xpath="/entity_classes/entity_class[@name='zombieTemplateMale']">
<property name="LootListOnDeath" value="junk_items" />
</append>