Fix a small oversight from #6112. In the empty/placeholder indexed sound situation, although the sound should not be appended (since it indexed), it should still be treated as a new sound, in order for all the first-parse and first-initialize logic to run properly. Set the right value and add some comments to illuminate the logic.
Fix a small oversight from #6112. In the empty/placeholder indexed sound situation, although the sound should not be appended (since it indexed), it should still be treated as a new sound, in order for all the first-parse and first-initialize logic to run properly. Set the right value and add some comments to illuminate the logic.