The version you are using is no longer supported on this forum.
Please update to a modern version of Minecraft to receive support.
Currently, supported versions are 1.19.4 (Latest) and 1.18.2 (LTS).
As you said, it's likely that different integrations are for different versions of create. To be able to fix this, you would essentially have to find what version of create the mods were compiled against to verify compatibility.
I mean, you could use AABB to target people in the relevant range and then check if the entity is in front of the player. Since you know the player's y rotation, you can just check if the entity direction vector is between two vectors that make up your field of view.
How are you rendering them? Also, switching between different subclasses would definitely cause an issue with some of the additional transformations applied.
We do not support MCreator here since it usually generates code that is both wrong and makes incompatibilities with everything else. Anyway, there's the ChunkEvent$Load for something like this.