Is this one of those "broken" ones where there is no actual restriction code?
Or is it either 8A or 3A, which are the two main restriction codes used for "unrestricted SVRs"? 8A bars break of journey in both directions (it is not entirely clear if this is deliberate or a mistake, but that's definitely what it says), 3A bars it on the outward only. So far as I am aware, 8A is the only restriction code that, either deliberately or accidentally, bars break of journey on the return portion of any walk-up fare other than "special" ones like SailRail. It used to be banned on the return on some heavily restricted Super Off Peaks years ago (LM liked this) but it hasn't been the case for years.
Edit: Sorry, not 3A, 3A has a morning restriction. There was another one, though, I forget what it was.
On a ticket that does have a weekday restriction, whether the BoJ restriction applies will depend on where it is in the restriction. Most have it in the notes which means it applies all the time, but there's the odd one that has it in the "applies Monday-Friday" bit in which case that would apply Monday-Friday only.
I would suggest that nationalrail.co.uk/<restriction code> is as definitive a check as you can do on this.