There are several factors you need to consider. The prop hit something and besides chipping the tip, the prop might have sustained stress fractures that might not be visible and these fractures could crack the prop to bust in half at a very inopportune time (like at 400’, or while flying over a tree, or while flying over a body of water, or over a highway, etc…). The propellers spin an average of 5,000 RPM and can reach a max of 10,000 RPM and that is a lot of centrifugal force on a questionable prop.
Link to a posting I made previously about the Motor’s RPMs…
Then, in line with that thinking, that prop lost a piece of itself and at max RPM that can cause a lot of imbalance and the can possible cause issues with your drone…
So, assuming that you will replace it, replace both, as a pair. The propellers are constructed at different times and possibly at different locations and the formula for the rosin material might vary somewhat and that would also cause an imbalance.
You paid a lot for that drone, don’t lose it because you got cheap…