Strange iOS Issues on Latest Flutter Release (1.21.0-6.0.pre.129 - Master Channel)

On the latest release of flutter, I have experienced some really strange behavior. I have the same implementation of the home view + bottom nav as the example, with singleton view models as the nav pages. For the past week+, I have had 0 issues with theming / reactive builds on Dark/Light mode changes on iOS + android.

With this home page setup, and valid, demonstrably working light and dark themes provided to my app, I noticed that on this latest release, as I change the system of my iOS device from Light to Dark mode and vice versa, that the Home View is not responding to those theme / color change events.

This issue does *not* happen on flutter Master 1.21.0-5.0.pre-37-g35e700518 - I have tested now where upgrading and downgrading flutter is the only change I make, and have identified this to be the root cause of the symptoms I am seeing, but I do not know, however, what the root cause of the actual behavior is.

Hopefully the community can band together and we can figure this weird one out!