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If you use LR, it should look somewhat like this: On top next to the image format is again a quality setting. If you use LR, or PS, max out that quality and export the shot again. If I'm correct, it should solve the problem.

I'm not sure what program you are using to export as a JPEG but it should have a quality setting. I'm using Affinity where it looks like this: As you see my quality is always 100%. The current quality you are using is good for most shots but occasionally it'll mess up a gradient like the sky...

Experimenting stitching wide-angle. It's not that easy with all the distortion.

Here's the shot at 75% quality. Zoomed: Pretty similar to the original shot. Artefact-wise. The posterisation in the sky still occurs at this quality while everything else looks normal in the full shot. If the quality is increased, the issue should disappear.

Yep. If I have to guess I'd say the JPEG quality during export is around 70% which doesn't trigger any visible issues in most of the shot but causes posterisation in the sky. It's only when there's this transition in the sky the quality issue surfaces. Here's a zoomed portion at quality 60%...

I saved the shot as JPEG different qualities and I think that shows where the problem originates.

Here's about the same magnification using the shot I processed and exported at max JPEG quality. Upping the quality fixes those artefacts.

I loaded the NEF in RT, applied the D750 cam (flat) + lens profile, increased exposure slightly (using the full range) and exported it as JPEG max quality (1024 long side, about 1MB file size). I do not see any posterisation in the full shot. I did however see some in the preview JPEG that...

I toyed with levels a bit to check what happens: Assuming you shoot RAW, the posterisation occurs during processing and exporting as JPEG. There's too much information being compressed and this can result in gaps between tones. It usually shows in (gradient) skies. You should be able to...

I suspect it to be related to the JPEG format. I notice more artefacts: Maybe you should upload the NEF and see if others have the same result when exporting as a JPEG. If not, it would allow you to exactly pinpoint the problem. Btw, the pixelation in the sky is probably posterisation. I...

Elvis ain't dead.

Experimenting with stitching to see how far I can boost the quality of my shots. For stills I think I can use this technique and simulate medium or large format cameras. 120Mpix shot.

I like the 30 minutes before sunrise more than sunrise itself.

Apparently I did some more attempts. Not the fastest to process at 4-500MB each Tiff. I wonder how many I can stitch before I can no longer handle the file.

It's culling time. Upgrading the processing of older shots and deleting what no longer meets the new criteria. It's going to take ages before I have enough GB to fill those M-disks.