Your data sheet for the BME280 states "The sensor has to be protected against all kinds of liquids, during processing (e.g. solder flux, cleaning agents)..."
Does the component already have to be masked with a Kapton dot, for example, to protect it from flux vapors during a standard convection soldering process? How high is the probability of a component defect due to flux vapors?
Is it theoretically possible to order the component with a protective cover on tape & reel?