A unit with StandardOutput=journal (the default) will get its stdout/stderr sockets disconnected when journald stops, as the file descriptors on journald's side are not preserved (it works on restart, as the FD Store keeps them open during restarts). Set FileDescriptorStorePreserve=yes so that the journal FD's stay open during a soft reboot, and applications don't get broken stdout/stderr.
System and Service Manager
Details
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