Second-Order RLC Circuit and Short Circuits
A voltage source has zero internal resistance, which means that a capacitor across it will follow any variation of voltage, resulting in an infinite valued current through it. In LTspice (note the spelling) and SPICE, in general, the voltage source has a limited resistance due to the machine precision, so plotting the current through the capacitor will show a limited value, but still very large. It will also be a function of the derivative of the finite slope that will make for the rising time of the source (it has to have a finite value, it can't be zero). E.g. for a 1 V / 1 µs rise the current will be a pulse of 1 MA for 1 µs. This means that your first picture is simplified to a series RL.