We got a bug report from someone in the company that the share icon was missing, and after investigating we saw the other icons (for edit and delete) were visible but not sharing. Long story short, they used an adblocker with a setting to block social media sharing links (Facebook likes, Twitter follows, etc) and it was also removing our icon.
In this instance, maybe it'd be fine to turn it off for localhost and keep it on for staging but still...