Windows 11 Insider Experimental Build 26340.9233 experienced two SYSTEM_SERVICE_EXCEPTION green screen crashes. Analysis of corresponding minidumps revealed identical failure details, including the exact faulting function, call stack, and process. The crashes consistently occurred during Windows' process termination sequence. Specifically, the system failed while destroying a process's associated desktop object and cleaning up magnification input transform states.WinDbg analysis pinpointed the issue to win32kfull!SetMagnificationInputTransform. A null pointer dereference at this function, specifically an attempt to read from memory address zero, caused the 0xC0000005 exception. The call stack shows the crash originates from NtTerminateProcess, cascading through several kernel functions related to process and desktop cleanup. The critical path involves the destruction of the desktop and the subsequent invalidation of magnification input transforms.Both crashes exhibited the same stop code, exception type, failure hash, and triggering process, codex-command-runner-0.149.0-alpha.4.1.exe. This demonstrates a high degree of reproducibility, ruling out random hardware errors. The problem appears to be triggered during the exit of the codex-command-runner application, which likely involves the creation and destruction of temporary or isolated desktops. The actual memory access violation occurs within Windows' kernel, win32kfull.sys.Under normal circumstances, Windows should safely clean up magnification input transform states when a user-mode process terminates or its desktop objects are destroyed. The current behavior deviates, as the win32kfull!SetMagnificationInputTransform function fails to validate an object before accessing it, leading to a system-wide crash. Microsoft is requested to investigate the object lifetime, null pointer checks, and potential race conditions within the magnification input transform cleanup path in build 26340.9233. Particular attention should be paid to changes related to Magnifier and how short-lived desktops are handled.