if (!meta.hasCustomEffects()) return;
json.add(POTION_EFFECTS, convertPotionEffectList(meta.getCustomEffects()));
}
else
{
JsonElement element = json.get(POTION_EFFECTS);
if (element == null) element = json.get(POTION_EFFECTS_OLD);
if (element == null) return;
meta.clearCustomEffects();
for (PotionEffect pe : convertPotionEffectList(element))