If a ViewAttachmentComponent moves into frame, it is low resolution until something changes the view while it is in frame.
Video demonstrating the behavior: https://youtu.be/KXEFFiAnv1s
I am on visionOS 27 beta 4. This did not occur when I was on visionOS 26.5. Also using Xcode 27.0 beta 4 and macOS 27.0 beta 4.
To reproduce, have a ViewAttachmentComponent in an immersive space, look away, then look back, and it'll be low resolution. Anything which would change the view while it's in frame will then cause it to update in full resolution.
Screenshot of low-resolution view after it moves back into frame from being out of frame:
Screenshot after updating the view, making it high-resolution again:
I've submitted feedback as FB24116473.