Console backend's log format should be prefixed and suffixed with newlines.

This is how upstream does it by default.

config/config.exs

@@ -181,7 +181,7 @@ config :pleroma, Pleroma.Web.Endpoint,
 # Configures Elixir's Logger
 config :logger, :console,
   level: :debug,
-  format: "$time $metadata[$level] $message\n",
+  format: "\n$time $metadata[$level] $message\n",
   metadata: [:request_id]
 
 config :logger, :ex_syslogger,