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RSR is a new feature. https://support.apple.com/guide/deployment/manage-rapid-security-responses-dep93ff7ea78/web https://support.apple.com/guide/deployment/man

• Amorymeltzer 3y ago
  Indeed, here's the crucial quote: >Rapid Security Responses that involve the operating system require the device to restart. On macOS, the updated operating system content may be made available to Safari and its associated processes with just a relaunch of those processes, though a restart is required to make this content broadly available to the rest of the operating system.