Just re-read your post, and I notice your statement about what Lili said. I am not sure about being able to enter via any entrance on the second day. You definitely can enter at any time on the second day. Friends of ours were at Plitvice in May 2019, and they had the 2-day ticket. They also stayed at Plitvice Miric Inn, and they bought tickets for Entrance 2. On the second day, they tried to enter via Entrance 1, but they weren't allowed to do that. Because they were driving to Zagreb after visiting Plitvice, they decided not to spend time taking the shuttle bus back to Entrance 2, so instead they bought one-day tickets for that day. So, when we went, we entered via Entrance 2 on both days.
So I'm not sure Lili is correct about that, unless Plitvice changed its rules for 2020. Maybe you can email the park and ask?