Senior gardaí have told the Policing Authority that a comprehensive peer review of homicide figures is unlikely to be completed by September.
The issue of the misclassification of homicide figures came to light last April, when a review of more than 500 cases between 2013 and 2015 found that 41 cases had been misclassified.
An Garda Síochána is now carrying out a review of homicide cases from 2003 to 2017.
At a public meeting of the Policing Authority with acting Garda Commissioner Dónall Ó Cualáin and other senior garda members, the authority’s chairperson Josephine Feehily asked if gardaí have shown a lack of appreciation of the scale and gravity of the problem.
Commissioner Ó Cualáin accepted that "it could've been dealt with in a much faster way ... yes, the gravity of the situation was lost on some.
"The learning from this will be very important."
Ms Feehily described the issue as being "like Lemony Snicket ... a series of unfortunate events."
The meeting is also dealing with a review into the garda handling of the Jobstown incident involving former tánaiste Joan Burton in November 2014, when protestors surrounded a car, delaying her for a number of hours.
Mr Ó Cualáin said the term "qualified success" was accurate when describing how the gardaí handled the incident.
He was responding to questions from Policing Authority member Bob Collins.
Mr Ó Cualáin said the incident was "a very difficult event on the day, it was spontaneous and very difficult to police".
Today's meeting at Dublin Castle heard that the executive summary of the garda review into that incident will be published next week.