[Chad C. Mulligan]

And it suffered from some malfunction with power and propulsion, yes?

Apparently no, it did not suffer a propulsion failure. The track that has been reported show it veering to starboard as it approached the bridge, so a steering failure looks far more likely.

[Darksheare]

A loss of control of the propulsion is still a loss.
Ask Michael Hastings if his car racing off on him was a deficiency or not.