ah that was it. I did not know that was even an export setting. It seems to have been added in Blender 4.0 as this was never an issue in 3.0 up.
For anyone else that has this issue. You can find it here in Blender 4.X export settings.
Viewing post in Construct 3 3DObject Plugin comments
Try this with the original file:
https://kindeyegames.itch.io/c3-3dobject-alpha/devlog/828684/fix-accessors-add-s...