I've heard and have had this issue where both Sims will reset and drop the command when romantic actions were queued up. But the issue seems to stem from Sims who've been together since they were teens. I'm troubled to hear it's bleeding into the older Sims. Why give us an EP such as Lovestruck, just to have this happen? It truly is a nightmare. Not only that, but after I got my young couple (they are both now YAs, and happily married with twin baby boys) over this problem by removing their relationship to clear it and then restoring it, the next time I opened this save to play, they were back where they started, after this latest patch. Happy anniversary to me! 😮.
I removed my Mods folder and then did a game repair. I'm very happy to report, it solved my problems.