A weird window popped up saying "Battery 3 Demo Installer" needs permission to access system. Tracing it to:
MusicTechFocus/Music Tech Focus Logic Pro/Plug-in demo versions/Battery 3 Demo Installer.app
Apparently it was triggered by Spotlight Search.
macOS Sierra Version 10.12 Beta (16A270f).
That file has been there for years. Don't know why it decided to popup.
12:10:45.416372 -0700
Battery 3 Installer
getgrouplist called triggering group enumeration
com.apple.message.value: 50
com.apple.message.domain: com.apple.system.libinfo
com.apple.message.result: noop
com.apple.message.signature: getgrouplist
SenderMachUUID: 00000000-0000-0000-0000-000000000000