Suspend not working (immediate resume) on my Thinkpad T14 after updates (starting 2025-08)

Which? The HibernateDelaySec=300 just sets it to 300s (5min), so I didn’t have to wait an hour after suspending in order to check if it wakes up again, saves RAM to disk and goes to hibernate. I reset that back after testing. It then goes to hibernate after 1 hour of being suspended or when the battery goes below 5%.