Did this just get fixed in the last 24 hours or so? I was just watching a program tonight through Plex on a 4K stick, and noticed it longer had horrible deinterlacing issues when the camera would pan around the scene! It was a very stark and noticeable improvement! I know Plex is not really a topic of discussion here, but that is always how I knew there was a problem with the 4K stick firmware. Incidentally, I have never had a problem with deinterlacing inside of Channels itself, as I have it set to software deinterlacing.
For reference, the source material that suddenly started playing better for me was a 1080i NBC broadcast originally recorded in WMC, and then copied over to a new Synology NAS when the old WMC machine was shut down. Since there was no way to bring these recordings into Channels, I loaded up Plex, and then noticed the 1080i issue.
My software version on my 4K stick is showing as 18.104.22.168. I didn’t find any release notes about this version online, but admittedly didn’t dig too deep either.
If others can confirm, it appears fixed for me!
Edit: It must be a pretty new update, Amazon’s own website doesn’t have the firmware listed, as of this post: