Shared file does not log properly

[stilnat]

For some context, I'm working on SS3D, an open source Unity video game, it's networked and I'm trying to use Serilog to log everything clients do. I have a shared file for that, using shared = true.
Issue is, while the logging in the Unity console works as expected, the logs in file are truncated, like so :

13:53 [Information] [ID = HOST] ########## SERVER STARTING ! ##########
13:54 [Information] [ID = HOST] ########## SERVER STARTING ! ##########
13:54 [Information] [ID = HOST] ########## CLIENT 1 STARTING ! ##########
13:54 [Information] [ID = HOST] client made primary click
13:55 [Information] [ID = HOST] ########## CLIENT 2 STARTING ! ####13:55 [I13:56 [Information] [ID = HOST] client made primary click
13:56 [Information] [ID = HOST] client made primary click
13:56 [Information] [ID = HOST] client made primary click
13:56 [Information] [ID = HOST] client made primary click
ck
13:55 [Information] [ID = 2] client made primary click

The result I was expecting was something like :

13:53 [Information] [ID = HOST] ########## SERVER STARTING ! ##########
13:54 [Information] [ID = HOST] ########## SERVER STARTING ! ##########
13:54 [Information] [ID = HOST] ########## CLIENT 1 STARTING ! ##########
13:54 [Information] [ID = HOST] client made primary click
13:55 [Information] [ID = HOST] ########## CLIENT 2 STARTING !
13:55 [I13:56 [Information] [ID = HOST] client made primary click
13:55 [Information] [ID = 2] client made primary click
13:55 [Information] [ID = 2] client made primary click
13:55 [Information] [ID = 2] client made primary click
13:55 [Information] [ID = 1] client made primary click
13:55 [Information] [ID = 1] client made primary click
13:55 [Information] [ID = 1] client made primary click
13:56 [Information] [ID = HOST] client made primary click
13:56 [Information] [ID = HOST] client made primary click
13:56 [Information] [ID = HOST] client made primary click

As you can see, some lines just didn't show up in the file, and some were truncated.
Code wise, I have a method that starts on clients and one on server, they both do nothing much more than setting the logger :

public override void OnStartClient()
{

    base.OnStartClient();

    if (IsHost)
    {
        return;
    }

    Log.Logger = new LoggerConfiguration()
        .Enrich.With(new ClientIdEnricher())
        .WriteTo.Unity3D()
        .WriteTo.File("C:/Users/Nat/Documents/GitHub/StilnatSS3DMain/Logs/LogSession.txt"
        , outputTemplate: "{Timestamp:HH:mm} [{Level}] [ID = {ClientId}] {Message}{NewLine}{Exception}"
        , shared: true)
        .CreateLogger();

    Log.Information("##########  CLIENT STARTING !  ##########");
}

public override void OnStartServer()
    {
        base.OnStartServer();
        if (IsServerOnly)
        {
            Log.Logger = new LoggerConfiguration()
                            .WriteTo.Unity3D()
                            .WriteTo.File("C:/Users/Nat/Documents/GitHub/StilnatSS3DMain/Logs/LogSession.txt"
                            , outputTemplate: "{Timestamp:HH:mm} [{Level}] [ID = SERVER] {Message}{NewLine}{Exception}"
                            , shared: true)
                            .CreateLogger();
        }
        else
        {
            Log.Logger = new LoggerConfiguration()
            .WriteTo.Unity3D()
            .WriteTo.File("C:/Users/Nat/Documents/GitHub/StilnatSS3DMain/Logs/LogSession.txt"
            , outputTemplate: "{Timestamp:HH:mm} [{Level}] [ID = HOST] {Message}{NewLine}{Exception}"
            , shared: true)
            .CreateLogger();
        }

        Log.Information("##########  SERVER STARTING !  ##########");
        ServerManager.OnRemoteConnectionState += HandleRemoteConnectionState;
}

Without shared equals true, and with an individual file for each client, this works as expected. Any idea how to solve the issue ?

[bartelink]

If you need a quick response, I'd suggest asking this on stack overflow instead; you have all the key ingredients for a good question there - here you're banking on finding someone who is both a Serilog maintainer/contributor (that watches the repo) who also understands the nature of the Unity3D integration, which is a very small one.

[stilnat]

@bartelink Thank you for your answer. True, but my hope was that my issue was not specific to Unity integration, more generally it's a concurrent access issue and I believed other application would have the same issue. I'm going to follow your advice anyway, I might get more luck.