Ok, I might've found a (dumb) workaround:
Rebuild your view inside .tabViewBottomAccessory using UIKit
Wrap it using UIViewRepresentable
Use the new wrapped view inside .tabViewBottomAccessory
Seems to be working, at least I'm not getting AttributeGraph warnings anymore and the re-renders are instant 🙃
Topic:
UI Frameworks
SubTopic:
SwiftUI