Slog3 blown out in source window but fine in sequence

[Guest]

I transcoded my Sony Slog3 Footage (HEVC 10Bit 422 UHD) to ProresHQ and then imported it in Premiere. 

I set the colour to Slog3/Gamut3Cine and now its blown out in the source window, but looks perfectly fine in a sequence and the program window. I double checked that the transcoded footage is still slog3 and the settings for the clips and the sequence colour management are identical. In the screenshot you can see the source and program window and the clip settings as well as the lumetri settings for the timeline. How can I fix it?

[R Neil Haugen]

Source shows the Source appearance, prior to changes in the app.

[Guest]

Usually I select all clips and then right click -> modify -> colour and select slog 3cinegamut.

And then my source footage looks right.

In this case not, it only looks right in the sequence so I guess its a bug.