There is no indication that the update 14.0.1 is related to camera OIS.
"This update includes bug fixes for your iPhone.
- Fixes an issue that could cause default browser and mail settings to reset after restarting your iPhone
- Addresses an issue that could prevent camera previews from displaying on iPhone 7 and iPhone 7 Plus
- Fixes an issue that could prevent your iPhone from connecting to Wi-Fi networks
- Resolves an issue that could prevent sending email with some mail providers
- Addresses an issue that could prevent images from appearing in the News widget"
(ref: https://www.macrumors.com/2020/09/24/apple-releases-ios-14-0-1/)
What is the issue with the OIS?
Have you tried reaching out to Apple Support?
Get a ticket here: https://getsupport.apple.com/
Schedule a call: Apple Support schedule phone call
Or via Social Media: https://twitter.com/AppleSupport.