NLog version: 6.0.1

Platform: .NET9 on Windows 11 24H2 and Ubuntu 24.04

Current NLog config (xml or C#, if relevant)

var fileTarget = new FileTarget("logfile") {
            FileName = Path.GetFullPath(Path.Combine(LogPath, "bot.log")),
            ArchiveEvery = FileArchivePeriod.Day,
            ArchiveSuffixFormat = ".{1:yyyyMMdd}.{0:0}",
            MaxArchiveDays = 30,
            KeepFileOpen = true,
            AutoFlush = false,
            OpenFileFlushTimeout = 1,
            Layout = "…",
};

• What is the current result?
  • On Windows: bot..1.log
  • On Linux: bot..250705.log (???)
• What is the expected result?
  I'd expect to see bot.20250705.0.log on all platforms
• Did you check the Internal log?
  No
• Please post full exception details (message, stacktrace, inner exceptions)
• Are there any workarounds? yes/no
• Is there a version in which it worked?
  I just want consistent naming after upgrading from v5
• Can you help us by writing a unit test?