"contained" failures in the FAR/JAR part 33 refer to engine casings integrity.
Uncontained failures FAR/JAR part 25 refer to any source of engine debris that might disable the aircraft. This does include the liberation of debris out of the front and back of the engine.
The sublety is in which regulation applies and to what manufacturers' design.
When it comes to serious aircraft damage there is no sublety and who cares who is at fault, just fix it.
The news media never sees these shades of grey and react just to broken bits alone, thus the so called on-off light switch approach to headlines.