Thanks for sharing.
Edit: do you have some sort of a “secret” features which resets the option_value if the value is not save by the form?
None I am aware of. If you reset the option value back to what it was when it was first imported, but leave the rest of the database untouched, do you experience the same issue?
Are you also able to replicate under default conditions (ie, no other plugins but ours and only a default, unmodified theme running)?