Can homomorphic treatment lead to disclose the context, and so break confidentiality?

Example: I want company X to perform an analysis on the data I output from a campaign of tensile testing. I send them encrypted data and ask them to fit a function between deformation and constraint (I say to X, my data is u and v), to obtain the response of my material to solicitation for future calculation

What prevents X from guessing what they are calculating, while the function they will fit is a physical response a technician will probably recognise?

(I know my example is bad cause this is a simple operation, with no need to outsource, but I have no better one)