I'm pretty sure this is not a PDC bug, but because ReaPitch/ReaFIR are non-linear, their behavior depends a lot on the position that playback began processing. In ReaPitch it actually depends on the material itself, too (so if it processes some silence before the material, the results can differ).
If you do this same test with ReaVerb (which is linear) it should null, even with considerable PDC (except right around the loop point where the reverb tails from the previous loop will be heard)
Similarly, if you test with ReaFIR but where it is not modifying the signal (EQ at default settings), it should null perfectly. If you do a small edit in ReaFIR, then it would not. You can also set ReaFIR (in EQ mode) to be linear, by checking the "reduce artifacts" box, in which case it should also null (except for right at the loop point where the filtering will differ when looping).
Last edited by Justin; 09-24-2017 at 10:49 AM.
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