BooleanQuery can not find all matches in special condition

query: (name:tang*)
doc=5137 score=1.0 doc:Document<stored,indexed<name:tangfulin>>
doc=11377 score=1.0 doc:Document<stored,indexed<name:tangfulin>>
query: name:tang* name:notexistnames
doc=5137 score=0.048133932 doc:Document<stored,indexed<name:tangfulin>>

It is two queries on the same index, one is just a prefix query in a
boolean query, and the other is a prefix query plus a term query in a
boolean query, all with Occur.SHOULD .

what I wonder is why the later query can not find the doc=11377 doc ?

the problem can be repreduced by the code in the attachment .