What about the following:
When you have rendered the first pass, you add the rendered file into the a project.
After that, you add the loop after the item as well, but move it toward the beginning by some samples, creating a crossfade.
This crossfade time must be cut away from the beginning of the first imported item.
That crossfade should do the trick and is, how I create seamless loops by hand.
To find the perfect ending of the crossfade-length, you can search for a zero-crossing.
Then, you render that item out again, including the crossfades at the end.
I have no idea, whether such a crossfade would be neccessary for the beginning as well.
Does my description make sense somehow?
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