I found nothing in the patch notes for classic or Kunark era talking about a change. My experience comes from someone that played a bard in Kunark era and it wasn't the case then.
Quote:
Ignite Bones (Necromancer) has had the movement component removed.
This means that it will no longer break root and snare spells, and that
it will now stack with the darkness line.
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This implies what you are talking about, I just can't find when it was changed.