Fine line on ORF Raw files in PL3

I posted recently that I had encountered an issue with a fine line appearing on PL3 when uploading Olympus Raw files. At first I though it was due to a recent upgrade to Big Sur. It now appears this phenomenon only occurs with images in landscape format. Once these are exported, or the images are being worked on in one of the PL tools, the line disappears. It does however reappear when I revert to the normal view.
Has anyone else experienced this? If so, any suggestions?

If you could post a screenshot of the issue and the RAW file, it might help us to diagnose the problem.

Attached is a screen shot of an affected image. DXO Support are also looking into this now.