Ok so here's an example, didn't actually take very long to get the fault on my system.
1. New session
2. 16 new stereo tracks, use signal generator to create audio
3. On first track, view "playlists" and then create say 5 new playlists on that track, with audio on them
4. Now even just separating a clip within any viewed playlist will create a momentary dropout in audio. As will moving the audio, etc etc. Any edits on the other tracks operate as normal, i.e. no dropout.
Here's a cheeky little vid to demonstrate :
https://youtu.be/7bVel0CUXPg