After upgrading to ASP.NET core 8, the logs using the property %thread print a generic thread name instead of the thread ID. The commit https://github.com/apache/logging-log4net/commit/ab74a0a3c0d90e8736bff29fca74e858947c0d24 seems to be related to a fix for the issue. Is there any timeline/date for when this will be release?