My understanding is that the unstable nature of how British cordite burned compared to how German cordite burned is the issue. There were several British ships that exploded at anchor: Bulwark, Natal, Vanguard... German ships as far as I know only exploded in combat and that would be attributed to actual magazine penetrations and the shells themselves exploding, not the propellant as was the case in RN ships.The problem to consider with exploding ships is that nobody knew for certain exactly what the problem was; they still don't. Enquiries and investigations were undertaken and measures were taken over an extended period. Handling procedures were tightened up, some types of ammunition were withdrawn (e.g. those containing pyrrhic acid and some HE types) and old ammunition was disposed of (the instability of cordite increases with age). Campbell suggests that work started on attempting to improve the propellant to German standards in "about 1920" and Brown suggests that it had similar properties by WW2.
Propellant is by its nature dangerous and German ships blew up in WW1 (and can do so in the game).
I believe that the ships cancelled at Washington would make a good subject for a game; America, Britain and Japan had some interesting contrasts in their design philosophies.