A privacy issue was addressed with improved checks. This issue is fixed in macOS Sequoia 15.5, macOS Sequoia 15.7, macOS Sonoma 14.8, macOS Tahoe 26. An app may be able to capture a screenshot of an app entering or exiting full screen mode.
https://support.apple.com/en-us/125112
https://support.apple.com/en-us/125111
https://support.apple.com/en-us/125110
https://support.apple.com/en-us/122716
http://seclists.org/fulldisclosure/2025/Sep/55
http://seclists.org/fulldisclosure/2025/Sep/54