Original Sin does not convert Tornado’s elemental damage to Chaos — bug or intended interaction?

Original Sin (Amethyst Ring)
100% of Elemental Damage Converted to Chaos Damage

Issue description:

When equipping Original Sin, I noticed that Tornado does not convert its elemental damage into Chaos damage, even though the ring states 100% of Elemental Damage Converted to Chaos Damage. Is this interaction intended, or is it a bug?

Well, the skill description is pretty bad, but id say the elemental gained is counted as extra and that is never converted. If its not counted as extra then it is a bug, but again stuff like this is usually "gained as Extra dmg" just a pretty bad description.

Tornado in PoE2 deals damage over time. It can't be converted.