We sailed on the Wish on Jan 30 with friends arriving around 11 or about 10 minutes after once we parked. Porters did not ask about PAT, just took the bags. We had a PAT of 12:45 (boarding group 17), and our friends had an 11:15 PAT (boarding group 5). Because we had our reservations linked and we were arriving together, we initially asked as we got to the entrance about getting into the terminal together, and they said they weren't even looking at PATs, and everyone was to get into the same line (instead of splitting into different lines outside based on PATs which I know they had been doing the week before). When we got into the building, they split into separate lines for Platinum (which we all were), Gold/Silver and first-time cruisers. As we checked in, we asked about aligning our PAT, which they did for us (after first checking something on the computer) so all of us had boarding group 5. We boarded about 12:05 pm. After going through check-in, security,
You won't "miss" your boarding group. If your boarding group has already been called, you can board any time afterwards. In fact, they announce boarding group 1, then boarding groups 1 and 2, then boarding groups 1-3, etc. until they reach open boarding.