BUG - Artifact Challenge 7.5 - I won 5* (%HP) Boots - Challenge uncompleted

Full name of your device:  HUAWEI Y6 Prime 2018 

The version of your OS: Android 8.0.0

Steps you performed in the game before the issue occurred.

1. I started challenges with 6.1, 6.2, 6.3

2. Goto to Part 7

3. Challenge 7.5

- Farming Stage 6 on Brutal - won 5*(%HP) boots

Challenge was not complete

Description of the issue.

5* artefact doesnot count as an correct artefact to complete 7.5 challenge

Regards 

Bahi