Facebook messenger calls, show only short name

When someone calls me on my FB messenger I can only see their short name. I noticed this change after I updated my iPhone to iOS14. Does anyone know how can I change it back? I have multiple people with the same short name and it is very difficult for me to understand who is who. I'm positive that I configured contacts properly like [this](https://support.apple.com/en-us/HT202590) yet messenger refuses to show full names.