Having trouble keeping a cast list in order

So are you saying that the old rule of "as it first aired" is no longer applicable?

Because in this case, where the program was first aired in the Eastern and Central USA time zones, it did not air with credits.

I do not have access to how it may have aired later in the Mountain and Pacific time zones.  All I know is that if you watch it now via streaming or other "re-run" types of broadcasts, it does have credits.  But as first aired, it did not.  It was a hot cut to the following show.  All that was on-screen during the ending where the credits would have normally been, was a count-down timer showing how much time remained until the following show started.

@ron3​ This sounds like a broadcast error in EDT/CDT which would not count in this case. 

This is certainly not a one-off broadcast error.  Shows being first-aired without credits, and then subsequently shown with credits is a semi-common occurrence.

See https://community-imdb.sprinklr.com/conversations/data-issues-policy-discussions/narrator-credit-in-imdb-even-when-not-credited-onscreen/5f4a79f88815453dba938789

and https://community-imdb.sprinklr.com/conversations/data-issues-policy-discussions/narrator-credit-in-imdb-even-when-not-credited-onscreen-part-2/628b8a755c183c026e2038ee

It has happened at least 7 times before on this series alone going off my submission records.

I've got almost 500 submissions (probably not all exactly like this) that show an attribute of "(voice) (uncredited)" with a Narrator, going back over a decade, which represents (to me) a show that didn't have end credits on-screen when first aired.