Does SAHI support merging of adjacent bboxes when using non-overlapping slices?

[iokarkan]

I'm trying to merge annotations of non-overlapping slices (so overlaps in slicing are both set to 0.0). I was under the impression that SAHI could merge adjacent bboxes, e.g. an object split in half between two adjacent slices.

I annotated the object both left and right, but when merging the annotations and using SAHI postprocessing (tried all algorithms and various threshold values) it seems the both annotations remain in the final set.

I also understand that when SAHI predicts on the entire image also, then there may be an encompassing bbox and that will provide overlap between left and right-adjacent bboxes, thus allowing for merging due to bbox overlap.

But does SAHI not support merging adjacent bboxes that have 0.0 overlap in two slices?