FIX for hologram displays from showing at version 1.14.2
To Fix this
1. uninstall protocol support
2. restart server
3. if u cant get in your server after uninstalling protocol support with 1.14.2 version, check if you have name tag edit plugin installed and uninstall it. After that restart server and try to join. Hope this fixed your issue with holograms from showing. Have a nice day