I was quoting someone on the iView thread who reported that bug with their latest firmware, not someone else on this thread.
I've been generally disappointed with the quality of the firmware for all these boxes. I'm just guessing, but I think there's a Chinese company that does the firmware for all these boxes "to order." But they don't have ATSC television in China, so there's no way for them to test it under real-world conditions, and AFAIK
few of the importers bother with beta testing. (HomeWorx is a rare exception that does beta test at least some of their firmware updates. Unfortunately, their firmware never fixed the channel rescan bug you asked about originally.)
Making matters worse is the fact that hardware manufacturers keep changing which chips they make, so the firmware has to keep being updated to match the hardware changes. When MStar (apparently) stopped making the 7816 chip, everyone switched to the 7802 instead, and ordered new firmware for the new chip. In many cases, bugs in the 7816 firmware versions that had finally been fixed reappeared in the 7802 versions, and had to be fixed all over again! It wasn't until mid-2016 that decent firmware for the 7802 finally started coming out.
Then iView tried to make more changes to try to deal with cable TV better, and it got all screwed up again
Luckily, they post their firmware on their web site, so you can revert to an earlier, better version like the one I linked to.