iPad physical-device reproduction: iPad mini (6th generation), iPadOS 26.6.1 (23G83).
Two independent Release app launches, no debugger/XCTest. App.swift unchanged from Apple report FB25336445.
All measurement results match across both runs.
Original UIView: 38,400 / 38,400 nontransparent pixels; 37,944 red pixels.
UIView snapshot: zero nontransparent pixels on clear; all 38,400 pixels remain cyan on prefilled target.
Child marker added to replica: 899 red pixels; original cached contents still absent.
UIWindow and UIScreen replicas: zero nontransparent pixels on clear; all 842,952 pixels remain cyan.
All drawHierarchy calls return true. Counts measured before PNG encoding.
This reproduces on a physical iPad running the 26 series as well as the previously tested iPhone on 27.0.1. It is not confined to the tested iPhone/27 configuration. OS and hardware differences remain confounded; this does not establish behavior on a 26-series iPhone or prove a specific private implementation cause.