Same for me, Ive entered into Engineering Mode/Hardware Test Mode (*#*#64663#*#*) .
Selected OTG test. #26 got an error message. "This test is not available in your MIUI version". On stable MIUI V5 KXDCNBF24.0
Tried Developer 8.22 MIUI V5 and the latest Dev version MIUI V6 still problematic...