I have had it were devs could run locally, but their machine was not setup like production and they included some library, dll, or other dependency that was on

I have had it were devs could run locally, but their machine was not setup like production and they included some library, dll, or other dependency that was on their laptop into the project and then it blows up in prod.... fun times... even more fun when that project is a GUI app installed on lots of computers and now you have a new dependency to roll out to every system because it would be too hard for the dev to revert and fix it where the code did not need that dependency... Even more fun when that dependency comes from licensed software that you only have a limited number of licenses for