Simulation results seem affected by unconnected source

An RLC circuit voltage settles to a steady amplitude as shown.
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After adding a voltage source sine wave but left unconnected, the results appear to have a ripple. Node 2 is in both cases between L and C. LTspice does not seem to be affected in this mannser.
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Is this effect a result of the time step being affected by the sinewave source? Am i missing anything?

See .TRAN

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