Ember, I don't think you need that info from Trevor, other than we use the Windows versions of BIAB. I've received this result on BIAB ever since the feature was introduced. We don't want to denigrate the Natural Arrangement feature, because it does have its uses and can sound great. There are several threads dealing with this in the developer area. In particular, you could look for one of mine asking about how it's supposed to work. We are just trying to help.

BIAB 2023 Win Audiophile. Software: Studio One 6 Pro, Swam horns, Audition 3, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & A5X monitors