Sorry, I just got the YouTube video of you finding the issue.
Good find. It is never common for the plugs to be loose unless they were never torqued when installed.
Roy
Oct 6, 2020 at 3:20 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.