Well, an example I have from work, where we have a certain very old and obscure process to build fixes for our application. It's somewhat a manual process. Somebody wrote a program to check if this manual process was done correctly. It prevents problems, but better would be to replace this manual process with an automated one, however that would mean to change the process somewhat to accommodate the automation (this is sometimes necessary since humans can deal with weird exceptions much better than machines).

Another example could be used linter or valgrind to prevent C-style bugs with pointers and allocation, instead of using a high-level enough language, such as Java, to avoid those in the first place.