大单于:should be da'chan'yu，but now da'dan'yu
行省:should be xing'sheng，but now hang'sheng
using Yunye and Yunxi Both can reproduce the problem
Thanks for reaching out to us! I can understand that "大单于" and "行省" are ancient Chinese proper nouns and this should be corner cases which we are not covering. Sorry for the experience and I have forwarded this issue to Speech team, a fix will be here for this issue.
Hope this will help. Please let us know if any further queries.
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