Invite in issue

Not sure if this is considered a bug and didn't see it on the bug list. I started playing a new save last week. My sim is dating an NPC, and when he invites her in, she waves her hand and shrugs. I have the door locked to everyone but the Sim who lives there, but I thought if another sim is invited in, the locked door wasn't an issue. At least that's how it was in my other saves.

Anyone else having this issue? Did something change? I read in another thread on another topic that your Sims can give other Sims a key, but I don't see that interaction. It must be one from a pack. I only have the base game and GTW.

Thanks in advance for your help.