Clicks in audio after processing in WL

I was wondering if these are being caused by WL or something else. I have attached a zoomed in pic of the click. I am processing about 20 files at the same time using batproc and I notice that each time a file completes/saves, it pauses all of the other files being processed and I’m wondering if this is the reason I’m getting these clicks? They are not in the original audio and I have tried various hard drives but yet these clicks still appear at random places?

What process is applied?

quite a few 3rd party plugins in the chain

When one get such an issue, one has to remove plugins one by one to generally find the culprit.