Seeing a few issues - some may be affect Aerial, some are more general:

• Tahoe no longer has a Screen Saver pane! It's been removed and is now a modal dialog from within the Wallpaper settings. The modal window is even smaller than the System Settings window, and it's not resizable either.
• There may be a problem again with "previewMode" being misreported by the LegacyScreensaver process? There have been bugs in Sequoia and Sonoma with ScreensaverView.Init(frame: isPreview) with both the frame and isPreview boolean being incorrect, and I think something similar is happening in Tahoe.