Temporal NR affecting color

When I add noise reduction on the last node, fades the colours. (I am grading Slog3 footages currently.)

More threshold more fades the colour grading. I feels like the Temporal NR Sample frames used the raw ungraded frames from video.

Currently I am on 17.0 beta 5 build 15 MacOS.

I also checked and reproduced this error on Windows. Can anyone else confirm this?

Nodes looks like this:

Node 1: some corrections, usually exposure correction
Node 2: Color space transform (OFX)
Node 3: Temporal NR

If Temporal NR treshold 0 the colors are correct. Raising the treshold fades the colors better.

This is a pretty big problem for me, as I usually use the last node for noise reduction. I know in terms of performance is not the best, but the result is better.

I can't duplicate this in Studio 17b5 for Windows, tested with ProRes from the original Pocket, but without the CST node.

Works well without Color space transform OFX plugin. According to this, OFX is not processed on the neighboring frames. Some performance optimization may be causing this error. Can Blackmagic confirm this?

The same problem exists with the Neat Video noise reduction plugin. I think other OFX plugins are also affected by this problem. Something very bad is happening. This makes my workflow completely impossible.