That is almost always the way it is with these things, but...it is good to keep in mind that deliberate arson is not unknown in these things, as other posters have pointed out.
Also, it is pretty clear the ship was non-operational and undergoing a refit. I wouldn’t be too harsh on the skeleton crew if you had a nasty fire like that and there were only a small number aboard...particularly if the person in charge on board was a somewhat junior officer with little experience.
Here is a little more background with what has been going on with the rehab and mentions fires aboard other ships during rehab..
https://news.usni.org/2020/07/13/warships-in-maintenance-always-face-increased-risk-for-fire-damage