IOS 12 iPad goes to sleep when plugged in
I have multiple iPad 9.7's that are used as Zoom Room Video Conferencing Scheduling Displays that need their screens to stay powered on all the time. They are permanently mounted with power cables connected and locked on the Zoom Rooms app using guided access. Of 7 total iPads, 5 were updated to IOS 12 today. After they rebooted all 5 of the IOS 12 iPads will shut their screens down after roughly 15-20 minutes. I have verified in settings under 'Display & brightness' that 'auto-lock' is set to 'never' but the problem still exists. It is consistent across all 5 running IOS 12. Neither of the 2 iPads running IOS 11.4.1 with the exact same app version, guided access and auto-lock settings are experiencing the issue. I've tried relaunching the app, disabling guided access, soft reboots, hard reboots, changing auto-lock settings to 2min, 15min, never, etc with no change. Under 'general' / 'battery' it shows time for 'uptime' but zero minutes for 'sleep' time.
Anyone else experiencing similar issues either in this app or any other on IOS 12?
iPad (6th gen) Wi-Fi, iOS 12, null