So the bug must be: when reporting more than one point at the same time,
make sure their mnc's are accurately recorded: they might not always be
the same!
Here is a similar patch of two cells for each interval, but the mnc bug
is not revealed, because they are both the same mnc:
Here we observe the mnc field switches from 66 to 3 and then stays that way, not in tune with the other fields.
So the bug must be: when reporting more than one point at the same time, make sure their mnc's are accurately recorded: they might not always be the same!
Here is a similar patch of two cells for each interval, but the mnc bug is not revealed, because they are both the same mnc: