When I record, sometimes the regions do not draw in real time. For example, if I record drum tracks, such as 10 tracks at once, some tracks draw in real time and some do not. This has happened with several earlier versions of Ardour and Harrison Mixbus. Now 9.2.0 I use Linux. This has happened with Ubuntu Studio and earlier also with AV Linux.
Additionally, the record button does not always turn red, even though recording is actually enabled. However, the audio is recorded correctly on those tracks. When the recording stops, the regions are drawn correctly.