You don't provide any real detail in your post so I can only comment very generally.
Regardless of the outcome it would be appropriate for the operator's risk management processes to include a protocol which refers a significant concern back to the tech engineers who developed the loading system and associated documentation. It is very easy for those at the coal face, who don't usually have all the detail, to presume/assume things which may not be correct - hence it should be referred back to the techo group for resolution.
Were that to be done, a technically appropriate answer should be the outcome and all parties can then move along with the details of the answer. Stuff which has the potential to cause major risk ought not be the stuff of guesswork and part knowledge.
In any case, I suggest that your manager's reported reaction probably was not very helpful …. One could opine that there just might be a significant risk culture problem within parts of your operation ?