Some characters are missing while viewing PDF file in iBooks.
I am viewing a PDF file in iBooks on iPad with IOS version 9.3.6. This file contains Chinese characters and some of them are missing from it while viewing the file in iBooks but when I view the same file in adobe reader, all the characters of file shows perfectly. PDF file has embedded font SimSun and the encoding used for font is Identity-H. Kindly help me and tell me the reason for this issue. The images are attached.
iPad Air 3 WiFi, Cellular