MacBook not shutting down properly on Sequoia - stays awake continuously

I'm experiencing a critical shutdown issue on macOS Sequoia 15.1 with MacBook Air M2 and Mac Mini M4

• When I shut down via Apple Menu → Shut Down, the screen goes black within 5 seconds (appears normal)
• Mac never actually shuts down - stays awake the entire time
• Example: Shut down at 1:45 PM, reopened at 4:45 PM → Screen Time shows 16h 45m (not 3 hours)
• This happens consistently at any time of day, not just overnight
• Battery drains 4-5% during "shutdown"
• Finder runtime matches Screen Time

Diagnostic findings:

pmset -g log

Shows Calendar scheduling wake events:

wake at [TIME] by 'com.apple.alarm.user-invisible-com.apple.calaccessd.travelEngine.periodicRefreshTimer'

Steps already tried:

• Disabled "Wake for network access"

sudo pmset -a proximitywake 0 and womp 0
sudo pmset schedule cancelall (events recreate themselves)

• Turned off Bluetooth before shutdown
• Waited 60+ seconds before closing the lid
• Time to Leave alerts are already disabled in Calendar

Question: How do I stop Calendar's travel engine from preventing shutdown? The Mac appears to shut down but stays running indefinitely. Is this a known Sequoia bug?

System: MacBook Air M2, macOS 15.7.2