I'm studying with OU as well in 2023/24 and every module has a review date where the uni either decide to continue it ir make it obselete. It shouldn't affect your overall degree but I have heard a couple cases where the OU has gotten rid of entire pathways leaving students with no option but to take the BA/BSc Open degree. The chances of this happening is slim though so I wouldn't worry too much. Hope this helps.
I have heard a couple cases where the OU has gotten rid of entire pathways leaving students with no option but to take the BA/BSc Open degree
Provided you register for an actual degree (rather than just completing modules with the intention of linking them later), the regulations oblige them to offer a "teach-out" arrangement allowing you to complete the original qualification (provided you continue to study at 60+ credits/year and don't fail anything).