why seam_finder gc_color result is changing over iteration?

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HI everybody,

I'm looking at seam_finder results, GC_COLOR in detail stitching, OPENCV 4.2..0.

I noticed that the result is changing over iterations on some fixed pictures. (using "--blend no" to be sure to spot the computed path). I get down in the code down to gcgraph.hpp (maxFlow )and can't find any random start.

Is this a bug or I missed something?