Use the DNG 11.2.1 beta until Camera Raw is updated.
Convert your Raw files to DNG format then open the DNG files (not the Raw files) in Photoshop.
Keep the Raw files so you can open them directly when Camera Raw is updated.
We are happy to announce Camera Raw 11.2.1
The Canon EOS RP raw files should be supported in this update release of Camera raw.
Camera Raw 11.2.1 which, in addition to the new camera support listed below, includes a bug fix affecting the opening raw files stored on a NAS. This change should fix issues with Bridge and Lightroom Classic opening raw files using Edit in Photoshop. Note: It is necessary to install the Camera Raw update to fix this issue. Installing Lightroom Classic 8.2.1 alone will not affect the issue.
New camera raw file support added in this release:
You can install the updates on desktop applications via the Creative Cloud App. [CTRL/CMD]+[ALT/OPT]+[ R ] will refresh your app if the update doesn’t appear. See Keep your Lightroom version up to date and Update apps to the latest release of Adobe Creative Cloud
Let us know if you continue to face any issues.