I confirm this and I'd say it pretty much happens every time in multiplayer.
Btw balance-wise chain explosion benefits well-built railguns more because it gets rid of mass, with this bug the remaining pieces weigh down the ship a lot. If you want a nerf to railguns you can leave the "bug" in and put something like a damaging power surge through the whole railgun. I kind of like it more without chain explosions personally.