Adobe Lightroom 12 Crushing Shadows 2019 i9 27" iMac with Radeon Pro Vega 48 8 GB

I've struggled with Lightroom Classic 12 crushing shadows or posterization in the shadows since LR12 was released last fall. I've contacted Adobe and started a thread in their support community. So far, there have been no solutions. Many suggested the problem lies with the graphics card. In my case, it's the Radeon Pro Vega 48. I understand driver updates for the graphics card comes via OS updates. I've gone through several OS updates since the problem started and am currently running Ventura 13.4.1. and Lightroom Classic 12.4 and still experiencing the same problem. What is the process to report this to Apple and Radeon? Soon LR and ACR will require the GP to run the apps. Any help or guidance would be greatly appreciated. Thank You! DD