It is best practice to never modify a product listing outside of our app when you have a running test for that same product. This could lead to multiple variable changes during the duration of a test, which would make it impossible to know which variable change helped or hurt the overall test performance.
“In an experiment, scientists only test one variable at a time to ensure the results can be attributed to that variable. If more than one variable is changed, scientists cannot attribute the changes to one cause.”
-Google AI
