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Brother, we are using the original one and together with QC 3.0 certified, but nothing shows up at the status bar.
AFAIK, for MIUI 11, they've changed the QC icon to a double Lightning icon.
That's strange. I have the stock charger brick and cable that came with the device, and even after MIUI 11, QC works without any issues. The two lightning bolt icon is there everytime I plug in and the charging time hasn't changed from MIUI 10.