same here, the proposed solution seems to resolve this, but can we get some insight why is this happening?

You can also check this article medium.com/swlh/swift-3d-model-animations-in-arkit-demystified-6a191ce76 it has very detailed process of handling Blender export and animations

Can we get a link to this issue? Also is there any progress on this?

Is this fixed, do we have some example of this working?

getting a similar issue: ERROR ITMS-90432: "Invalid Swift Support. The file Runner.app/Frameworks/.last_build_id doesn’t have the correct file type for this location. Ensure you’re using the correct file, rebuild your app using the current public (GM) version of Xcode, and resubmit it." Make sure to show hidden files Shift + CMD + . to see them...