• Environment: • Xcode 27.1 (27A9275) • macOS 27.0.1 (26A434) • Mac Studio M1 Max, 32 GB • Coding assistant with an external agent (Claude Agent SDK) • Xcode under heavy load (indexing/build, several agent sessions, simulators) • Steps: Xcode busy → agent requests a permission → click Allow while the prompt is still fading in. • Expected: The click is handled or ignored until the prompt is ready; Xcode stays responsive. • Actual: Xcode hangs immediately; force quit and relaunch are required, and all agent sessions are lost. Waiting until the prompt is fully visible works fine.