This only happens in old or defective guns that were made before the introduction of the .357, which do not have a shoulder in the chamber to prevent loading the longer round.
Those guns are not defective they were made exactly as they were intended to be made. There are thousands of them in existence. Face it, you’re arguing against the reality that .38s and .38 specials exist that .357 cartridges will slide right into and present a serious danger. It’s irresponsible and reckless to tell people that “.357 cartridges won’t ‘go in’ a .38.”