session.Log(message) not logged at all

[banyula]

Question

I recently converted several VS2022 Wix V3 old installers into Wix V6. Installers work fine, but all session.log(msg) issued in the Custom Actions are not displayed at all in the log. I tried several combinations, even setting Msilogging to "voicewarmupx" and nothing works. I remember that used to work in the past with Wix V3. Please advise how to troubleshoot.
My Custom action is writen in C# .NET 4.7.2
I use msiexec /i installer.msi /l*v logfile.log

At the beginning I thought the problem was in my development VM (Win10) but I tried the same installer in other VMs (Win10, Win11, Win2019) with the same lack of logging results. I want to emphasize, only the session.Log() messages are not displayed, all the rest is.

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[robmen]

Not clear what is going awry here. Session.Log() is a very fundamental API and haven't had anyone else reporting any issues.

[banyula]

I found the problem to be with Session.Log() used in a DoAction Custom Action (which is my case) and running in Full UI mode (UILevel = 5). It is documented in:
https://learn.microsoft.com/en-us/windows/win32/msi/returning-error-messages-from-custom-actions

So, I had to create a SessionLog() function in my CA to do the following:

        // Session Logging into a Property
        private static void SessionLog(Session session, string xmsg)
        {
            string uilevel = session["UILevel"];
            if (uilevel == "2" || uilevel == "3")   // msiexec /qn or /qb
            {
                // Quiet or Basic UI mode
                using (var record = new Record(0))
                {
                    record.FormatString = $"[\\[]Entropiq:MSI:Installer[\\]] {xmsg}";
                    session.Message(InstallMessage.Info, record);
                }
            }
            else
            {
                // GUI mode (Session.Log does not work in DoAction Custom Actions
                session["zLogging"] = $"[Entropiq:MSI:Installer] {xmsg}";
            }
        }

I know that creating a session variable (session["zLogging"]) is not elegant but at least I am able to see my CA messages in the log.