[CHEAT] Edit relationship in cas not saving (Partner)

I couldn't find any other reports on cas edits that won't go through to change a sim to a spouse, specifically, so I am posting here. I had two instances like this. One my sim's spouse died but cas would not let her have a new spouse, only a partner (would them being vampires make a difference?). The other was two sims living together but not married who had a child. When I tried to make them spouses in cas I saw them showing as sisters and in the new family tree they show as half-sisters. I do not use any mods or cc.

I am having a similar issue, however, it seems to be affecting more than just CAS, as with the new Royalty and Legacy pack, every time my sims woohoo, they get a sentiment that they've seen each other doing something scandalous. They also won't autonomously perform romantic interactions with each other, and my sims continue to get calls from other sims that my sims should consider a relationship with each other even though they are already in a relationship.

I do have Lumpinou's RPO mod in my mods folder, but I've been playing with mods off since before I started this save. I did remove the mods entirely and tried to adjust the relationship again, but that also hasn't worked.

Hello! 

In the past, I have been able to use cas.fulleditmode to edit the relationships of townies in CAS. Today, I went to do this, and it said I could not edit pre-existing townies. I was not getting this message in any other place in CAS, such as sexuality or gender identity. It was just there. I used to use the cheat to make different Sims spouses since the game does not automatically non-played Sims together, but it didn't work today even after restarting the game as well as trying it in both manage worlds and live mode. If this change was done on purpose, it is definitely an inconvenient one. 😅

I don't use mods or CC.