It's painful to read some of the math illiteracy in this thread.
Also while dx's math is correct, the P99 drop rate is probably higher than 8%. If the drop rates were 60% / 25% / 15%, then the math is 126 * 0.15^5 * 0.85^4 = 0.5% Which is still quite unlikely and worth a bug report, but the reality is that rare events happen all the time.
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