Opinion on whether or not to divide a season?

Here's a strange situation... The Bob Monkhouse Show: https://www.imdb.com/title/tt0297508

It was a show that aired on BBC2, then, 2-6 months later, they'd run the lot again on BBC1 as a repeat. All, that is, except for the last two episodes. Which is where it gets weird.

Each time they'd show the seasons on repeat, they'd jiggle the order around, presumably to put the popular episodes first, I don't know. 

So season three ran on BBC2 from 13th Jan-3rd March 1986, eight episodes, and that was it. But this is where it gets a bit complicated.

In June 1986 they put on season three for its traditional BBC1 repeat, except... to start the season off, they had two brand new episodes to go with it. And this was a live show, with news-related jokes at the start, so it wasn't something held back, it was brand new.

After these two new episodes, they screened the original eight in a random order, making season three... 10 episodes.

Even weirder, in the first new episode, Bob says it's the start of a new series, and in the second of the new ones, he talks about viewers joining in again "next week"... which is true, it was on air the following week, but it was just a repeat.

Is this a unique situation? While the distance between the two is quite small (three months) the two new episodes were created specifically to go at the start of the already-completed season three. On the IMDb they're listed as episodes 9 and 10, which is fair, as they aired after the other eight, but in terms of their own order within the logic of the show, they were created to act as episodes 1 and 2. They were never AIRED ninth and tenth, only as first and second.

So, my question (I got to the point eventually) is......... do they get left as 3.9 and 3.10, or would it be more logical to make them 4.1 and 4.2?