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[fuzzyBSc <1931554@xxxxxxxxxxxxxxxxxx>]

I think I'm narrowing down on the source of the issue. I'm seeing crashes in ibus-engine-mozc as part of package ibus-mozc
After building from source and installing debug symbols the key parts of the stack trace appears to be as follows

#10 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::assign<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, void>(__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >)Python Exception <class 'gdb.error'> value has been optimised out: 
Python Exception <class 'gdb.error'> value has been optimised out: 
 (__last=, __first=, this=0x7ffc45391578)
    at /usr/include/c++/10/bits/basic_string.h:1471
#11 mozc::ibus::(anonymous namespace)::GetSurroundingText(_IBusEngine*, mozc::ibus::SelectionMonitorInterface*, mozc::ibus::(anonymous namespace)::SurroundingTextInfo*) [clone .part.0] [clone .constprop.0]
    (engine=<optimised out>, selection_monitor=<optimised out>, info=0x7ffc45391530) at ../../unix/ibus/mozc_engine.cc:207
#12 0x000056510ef5e7c8 in mozc::ibus::(anonymous namespace)::GetSurroundingText
    (info=0x7ffc45391530, selection_monitor=<optimised out>, engine=0x56510fc2c410) at ../../unix/ibus/mozc_engine.cc:170
#13 mozc::ibus::MozcEngine::ProcessKeyEvent(_IBusEngine*, unsigned int, unsigned int, unsigned int)
    (this=<optimised out>, engine=<optimised out>, keyval=<optimised out>, keycode=<optimised out>, modifiers=<optimised out>)
    at ../../unix/ibus/mozc_engine.cc:377

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https://bugs.launchpad.net/bugs/1931554

Title:
  Japanese hiragana input fails after first keypress in anki

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