Today's boss fight Summer Party Elegy Echo Boss Fight with Seraphina is bugged

Today's boss fight Summer Party Elegy Echo Boss Fight with Seraphina is bugged- One does 4 billion (total damage/leaves Seraphina at zero HP/Life) and game scores it as 150 points (half of what is needed to get the lowest prize). So, no prizes at all, Tried it 3 times, spent 50 and then 100 diamonds and top 150 points never changes. The three tries do not accumulate for better prizes. This part of the Summer Party Elegy Echo sales promotion does not function properly, does not gift any prizes after completing it or completely defeating the Seraphina Boss and no prizes are given at any time.

If one accumulates the 4 billion HP damage on Seraphina boss, the points awarded are just half (50%) of the 300 points that are required for the minimum prize. If one reaches the total damage of 4 billion on Seraphina one should receive 800 award points and the maximum prize (instead of NO PRIZE AT ALL).