Mystery armored boat

I’ve been looking at archives to try and find some info on smaller boats of the ROCN in 1945-1955 and found that they repaired some previously damaged boats leftover from the IJA in Taiwan.
I knew there was one armored boat leftover but it was half sunken and damaged in Keelung. But it looks like it got repaired. The more surprising thing is that it’s 80 tons and not 18-20 like other IJA armored boats. Anyone know what it might be?

Then in the ROC Keelung defense force.