[boost] boost log: attributes and different loggers

Hi, I am trying to use 2 loggers - 1 severity logger - 1 'normal' logger However, when I add sink->set_filter(flt::attr< severity_level >("Severity") >= level); to the severity logger sink and try to use the second logger I get: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::log_mt_posix::missing_value>

' what(): Requested attribute value not found

The second logger has no formatter: backend->set_formatter(fmt::stream << fmt::message()); Nor has it any attribute. I tried different solutions, but nothing works - what am I missing? Best, Dirk