If a bug is preventing you from moving in a spouse, then I feel we need to make an allowance and allow you to move in a potential spouse and then have the wedding. But it needs to be immediate — i.e. move in and wedding on the same day...zero delays.
Since Shirin's question was referring to the spouses of heirs, does that mean I failed? When I started my dynasty, I almost immediately moved in Pappy after he and Cadmium got engaged, but they got married a couple weeks after he moved in. No one had anything to say about it either, in spite of the gap between move-in time and marriage being made pretty clear in the story.
Even the rules (specifically under Household Matters) use the term "spouse/partner" multiple times, implying that heirs don't have to be married to who they move in. It's just that the spouse/partner in question is the only one they can move in, and the one who has to usher in the next generation. Or so I thought.