Yes it seems there is nothing wrong with the More the Merrier trigger. Not surprising that more the merrier doesn't have "end of current events in this version" inside it anywhere since it was just added this update, why would it ever have a dialogue saying it's the end of the event???So I kept trying to call the Uncle every ingame day from Linda's phone but every time I clicked "Uncle" it would say something along the lines of "end of current events in this version." Not that exact quote now that I think about it but it was very similar. Either way, it wouldn't let me trigger Amy coming to the ship and I couldn't start More the Merrier.
The menu option which starts The More the Merrier says "Call Uncle to confirm, you are ready for Amy to arrive"
This is the exact same message which you get if you load the 1/1 save and go back to the phone menu.
If you didn't delete your save you would see the "Call Uncle to confirm, you are ready for Amy to arrive" option in the phone menu during most of the day (It might be blocked during early morning or late at night etc).