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I had noticed the slight green tinge to that star bottom left as well, it was subtle but there.
I decided it might have been some flare on the lens and hoped it wasn't noticeable, be interesting to read what the follow up is.
This data though was lovely to use my favourite to process.

Which Nikon are you using?
There is a known problem with some and there is a detailed post about this on cloudynights. I think the posts was particularly relevant to the Nikon 5300D

Another option is to select all the problematic stars and exclude them from the colour module so they stay as just luminance.

I have got into the habit of turning tracking on or off as needed to facilitate denoise if I need it outside of regular workflow.

if you used the super structure module before denoise and create a mask over your M101 you could use the dim small preset to even the background tone out, then revisit colour module and balance the colours out.

This is super, thanks Ivo.

On a similar vane, if I do a single pixel and then grow blob the star I am covering the mask grows very angular, or grow used on a auto star mask grows increasingly angular so in the end my star is covered by a diamond type shape. It would be lovely if the star shape mask were to grow retaining a ci...

There is this very recent example
viewtopic.php?p=9567#p9567

You can split channels from a OSC file by using the compose module one channel at a time and save, repeat for the other channels.

I think i sussed what you did Burly, it is your red image did not look like it started out as mono which it needs to be before the image is then used in compose and loaded as red when you then use layer module. I am just recreating the process for each so I can comment better. 1 - what you need to d...