td, thanks.
The question relates to how regulatory authorities manage the period between identifying a problem and resolution by component change.
The engine issue - potential simultaneous loss, or lack of thrust control due to TAT / FADEC malfunction, tasked crews with the difficult identification of likely ICI conditions and avoidance - by a large margin.
I don't recall any adverse events in the interim period.
With an different system / aircraft affected by ICI, resulting in simultaneous loss of function, the regulator focussed on recovery; there were events with varying success depending on crew performance.