I think it is necessary to add Lower/Upper choices of the Field Order for the "Deinterlace source" button in HDlink.

The way it is now, I suppose HDlink guesses what the order is, and in my case (60i AVCHD files from Sony camcorder) the guess was consistently wrong, unfortunately.

I used Adobe Encoder as workaround, and that worked just fine since it allowed me to specify Lower field as order priority.

HDlink is part of Neo 4K v5 here.

All deinterlacing algorithm that convert 60i to 30p are not concerned with field order. One day I want to do a 60i to 60p deinterlacer, that is concerned with field order.

What I just observed clearly indicated that switching to lower field, then deinterlacing produced good results.

Simply Deinterlacing in HDlink (or Adobe Encoder with the Upper field priority) produced unpleasant jarring video. I think this may depend on the deinterlacing method as well. In any case, switching the Adobe deinterlacer to lower field priority solved the issue.