Here's the first other case I could find:

In 1989, when John Blount was just 17, he was convicted of a double homicide. Blount was sentenced to death, and later re-sentenced to life in prison without a chance for parole. While incarcerated, he started a mentoring program for kids, kept a nearly spotless disciplinary record, and got his GED. He was written up only once, for owning a contraband radio. In 2016, following a series of Supreme Court decisions deeming mandatory life-without-parole sentences unconstitutional for defendants under 18, Blount was made eligible for a resentencing. Before his resentencing hearing in 2018, his lawyer had worked with the Philadelphia district attorney’s office to negotiate a 29-year-to-life sentence. The judge, however, disagreed. “I cannot discount two lives,” said Judge Barbara McDermott after rejecting the negotiated sentence. “I believe in proportionality in a sentence.” Her sentence, 35 to life, will make him eligible for parole at the age of 52. (Blount’s attorney is now petitioning the Pennsylvania Supreme Court to consider the case.)

It used to be unheard of for Philadelphia judges to reject a negotiated sentence in these resentencings—until Larry Krasner, arguably the most progressive prosecutor in the country, took over the city’s district attorney’s office in January 2018 and started delivering on a promise to minimize incarceration. In response, several Philadelphia judges have shut down his attempts to keep people out of prison or release them earlier. Some, such as McDermott, have overruled resentencing agreements.

Second:

Judge Barbara McDermott — who has in a handful of other cases accepted deals for juvenile lifers negotiated by Krasner's administration — has begun to reject some of the agreements she's reviewed.

One was for John Blount, who shot and killed two men as a teenager in 1989. The district attorney offered 29 years to life. On March 26, McDermott rejected that deal and imposed a sentence of 35 years to life, the minimum set by current sentencing law for a first-degree murder by a juvenile. The other was for Omar Dennis, who according to Daily News reports from 1994 shot and killed a man who'd beaten him in a "fair fight." McDermott rejected a 24-years-to-life deal and imposed a 28-year minimum instead.