"Default" config with small "d" instead of big "D"

we have a custom app that creates a BOM via the API. We read the "Default" config of each assy in order to get a qty. We have a case where the name of the Default config is "default" with a small "d", instead of a large "D".

This is an addressable problem in the code and we can get around it, but it is strange that the config name has this subtle change...has anyone else seen unexpected changes to configuration names, including the default config?