It seems that in Framework 16.0.40 (or 40.1) new CDR settings where added to Advanced Settings. One of them is to enable or disable CDR logging and by default it is set to be enabled as logging CDRs is a default feature.
From Framework 16.0.40.2 to the current release of 16.0.40.4 disables CDR logging by default when you either update to one of those versions or install a new system that defaults to one of those versions.
So if you update to any of these versions of Framework make sure you go into Advanced Settings and ensure CDR Logging is enabled or once you reload/apply the config after updates…CDRs will stop logging.