I downloaded the build logs  and filtered them to show the missing symbols that 
were not already marked as optional.
plugwash@thinkpad:~$ wget -O zimlib.log 
'https://buildd.debian.org/status/fetch.php?pkg=zimlib&arch=amd64&ver=4.0.4-5%2Bb1&stamp=1591384179&raw=0'
plugwash@thinkpad:~$ html2text -width 100000 zimlib.log | grep MISSING | grep 
-v optional
+#MISSING: 4.0.4-5+b1# 
_ZTIN6icu_6314StringByteSinkINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEE@Base
 4.0.4
+#MISSING: 4.0.4-5+b1# 
_ZTSN6icu_6314StringByteSinkINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEE@Base
 4.0.4
+#MISSING: 4.0.4-5+b1# 
_ZTVN6icu_6314StringByteSinkINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEE@Base
 4.0.4
plugwash@thinkpad:~$

Decoding these with c++filt -n goves

typeinfo for icu_63::StringByteSink<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > >
typeinfo name for icu_63::StringByteSink<std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > >
vtable for icu_63::StringByteSink<std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > >

These look like ICU template instantiations to me and seem unlikely to be part 
of the public interface of zimlib. If I was the maintainer I would probablly 
just mark them as optional.

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