Alex Tutubalin of LibRaw writes:
We have support for Sony lossless compression in RawDigger 1.4.3:
(dual-arch Intel/M1 build for macOS 10.12 - 11.x)
FastRawViewer 1.7.3 release candidate, no direct link (this version updates frequently): https://www.fastrawviewer.com/blog/FastRawViewer-1-7-3-ReleaseCandidate
(download links are at page bottom)
Correct framing for Sony A1/APS-C crop mode is implemented in the latest builds only (namely: RawDigger 1.4.3-704, FastRawViewer 1.7.3-1711). If you're using some earlier version with Sony A1 files, please upgrade to the latest versions.