Unable to open "myfile.raf" because the file format module cannot interpret the file.

Since updating to Photoshop 27.5 with the new ACR engine, Super Resolution images (140 MP) won’t open anymore. I get this error:

“Unable to open ‘myfile.raf’ because the file format module cannot interpret the file.”

Before the update, I could open 3–5 of these 140 MP images (64 GB RAM) without any issue, for exposure blending and HDR work.