Downgrading from 4.6.2 that I was on to 4.5.1 seems to resolve the issue. I can see the magenta appear.
On 4.6.2 and 4.6.3, there's no magenta, and whenever the probe changes position, things don't seem to align properly and there's a strange smearing.
With the same settings in 4.5.1, it looks how I expect, similar to the video.