Crash in `agora.test.SlashingMisbehavingValidator`

[Geod24]

Unittesting agora.test.SlashingMisbehavingValidator..
terminate called after throwing an instance of 'std::runtime_error'
  what():  moved to a bad state (ballot protocol)
./ci/run.sh: line 21:  5753 Aborted                 (core dumped) ./build/agora-unittests

Witnessed on https://github.com/bosagora/agora/runs/2376182998?check_suite_focus=true