Msc Cruises Passport Debacle - Denied Boarding Due to Stamp Issue

On October 21, 2023, while trying to get back on the Msc Splendid at Piraeus port, I was denied entry by an Msc staff member named İ*** E******. They mentioned an issue with my passport control stamp as the reason. After enduring a long wait while standing in line for my passport, a Greek official informed me that waiting for a green passport was not required. When I asked İ*** about the absence of a warning, she insisted that it was not their responsibility. It seems that this oversight may be due to carelessness or a lack of information, as all of my details are clearly stated on my Msc card. Is the training for green passports and border exits lacking in any way? Warm regards.