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It doesn't require a full hydraulic lock and the diesel combustion chamber is certainly much smaller than that. Using the compression release may let the engine come up to a sufficient speed to bend a rod once the exhaust valve closes.

Here is an example of a jerk pump injection pump. Fuel enters through right port and leaves out top to injector. You can see that while the plunger is down, the injector pressurized by the lift pump. The left port is the spill port and ends injection. The engine stops when the slot is aligned...

In once case on a much larger engine we blew a fuel injector through a valve cover. The tip had broken on the injector and the fuel tank was above the engine. This allowed the cylinder to fill while the engine was not running and then hydraulic locked during the next start. When diesel engines...

Too much fuel in a cylinder can bend a rod. Is the fuel tank located above the engine?