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The window still showed, taskbar entry included. Two things. The taskbar button belongs to the FMX proxy window (TFMAppClass), a separate top-level window from the form — hiding the form alone never removed it. FindFMXAppWindow moves from private to public so the activate-hide can drop both. (Guarded on Assigned(FBridge): the handler is installed at line 222, the bridge is created at 268.) And rather than guess a fourth time at FMX's startup order — the same trap as the window-state saga, which only fell to instrumentation — this logs a millisecond timeline: FormCreate begin/end, the activate-hide, and the deferred MinimizeToTray. Whichever gap holds the second will be obvious. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>