Icebound Tomelith progress resets if party wipes

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Date & Time: 22:28 5th April 2018 GMT +10 time
Frequency: All the time
World name: Chocobo
Character name: Paca Kuma
Party or solo: Party
Area and coordinates: The Fields of Glory (Shatter)

Steps:
1. Start attacking an Icebound Tomelith with your team.
2. Make sure the opponents DO NOT attack the Tomelith.
3. Have the opponents kill all your team mates to make the Icebound Tomelith's name to turn yellow because no one alive has any agro on it.
4. Have the opponents kill the Icebound Tomelith.
5. They will get full credit for the Icebound Tomelith even if you did 90% of the damage.

I'm not sure how you think this is a bug? The ice has always worked like this. If you drop combat with it, either by running away or dying and releasing, you lose all credit to it.