I MAY HAVE FIGURED OUT WHAT THE ISSUE IS!!!
So with minecraft 1.14.4 being bundled with a specific version of Java that comes with the game I think that the issue is the older versions of minecraft do not have this option on the modded launchers such as FTB or Technic because they default to whatever version of Java is on your PC which may mean the version of Java and Minecraft are partially incompatible, I have no Idea how to fix this but this seems to be a real possibility
EDIT: I tried to use the same version of Java that the new launcher runs on JRE 8_51_x64 and The freezing still occurs