Not having Living Legends with me at this time, I don't remember: Did it actually make the jump (i.e. did it arrive after jumping from another system) or did it fail to "go anywhere" and just "jumped in place", arriving 300 years later?
In the 2780s, while following the Exodus fleet as a rear guard, Manassas meant to jump to the system Schwartz (rendevous point). However, the Schwartz was not with them and they "
ended up near a planet about thirty-five light-years away from the rendezvous, with its jump drive and communications crippled."
The Manassas's crew spent 6 months fixing problems and coming to recognize that the proper pronounciation of their captain's name, James Cromwell, was "Zap Brannigan." When the repairs were finished, the ship jumped again and had another, far more serious misjump. They did arrive at the target Schwartz, but after spending 300 years in hyperspace.
So, to answer your question: yes, the ship jump in space and time in its fateful jump. In the 2780s, it jumped from "unknown system X" with the intent of reaching "Schwartz," but instead arrived at "unknown system Y." After repairs, the Manassas jumped from "unknown system Y" to Schwartz, but spent 300 years completing the jump.
For that matter, is it ever mentioned in canon what happened to its crew?
Living Legends tries the old, "No such weirdness can be allowed in canon, so any ending kills them all."
Per pg38, Living Legends section, "Fate of the Manassas," most results are "Manassas is destroyed or captured by the Jaguars or wrecked beyond the level of duplication." There are several possible fates for the crew, which are discussed on pg43: either ComStar grabs them and makes them disappear "into a gilded cage" or the Jaguars grab them and turn them into slaves. These results are offered as plot hooks for further adventures (rescue the crew), which the GM will have to invent. As exemplified by Cromwell's fate (potentially a temporal anomaly spouting all sorts of fascinating things about the Star League), if freed, the crew of the Manassas could be media stars for at least their 15 minutes of fame.