An extra help is documenting reproduction steps so the fix can be verified. Black box testing: take these steps, see this incorrect result. Switch to the fixed version, follow the same steps, see correct result.
Following these steps builds trust with team members and users. Making a fix and not testing it can result in the problem not actually fixed because it wasn't tested. This erodes trust.
Related to https://github.com/matthewkmayer/matthewkmayer.github.io/issues/83 .
A good bugfix includes a reproduction, hopefully in a test. See https://matthewkmayer.github.io/blag/public/post/red-green-bugfix/ .
An extra help is documenting reproduction steps so the fix can be verified. Black box testing: take these steps, see this incorrect result. Switch to the fixed version, follow the same steps, see correct result.
Following these steps builds trust with team members and users. Making a fix and not testing it can result in the problem not actually fixed because it wasn't tested. This erodes trust.