Different zoom levels = different color casts - please fix this!

Problem: After exporting red color cast in blacks.

First, C1 renders correctly.
The error is in the preview!

If you want to see the whole image, as is usual for matching, C1 creates a green cast in the black area that is not there!?!?!?!?

In my example image, the sack looks correct and neutral grey (left). After the export it seems too red. But if you zoom into the image above 100%, the existing red cast becomes visible.

This behaviour should definitely be fixed!

One should be able to expect from a professional software that the colours are displayed consistently across all zoom levels - otherwise the software is useless!

Presumably, the higher the ISO number chosen for the shot and the noisier the image, the more the error has an effect.