Unwarranted ERROR for "more than one downstream segments"?

[wkitlasten]

Wondering if this error is addressed/corrected "on the fly" or if the error check is flawed. For each segment listed with this error "to_segnum" is a single number.

15:15:37.447:ERROR:SurfaceWaterNetwork:segment 325 has more than one downstream segments: [334, 333]

n.segments.loc[325]
geometry LINESTRING (1572048.4567999998 5197550.3902, 1...
to_segnum 334
from_segnums {312, 313, 314, 315}
cat_group 511
num_to_outlet 10
dist_to_outlet 5816.715528
sequence 487
stream_order 4
upstream_length 100151.74555
Name: 325, dtype: object

Another one:

15:15:37.449:ERROR:SurfaceWaterNetwork:segment 489 has more than one downstream segments: [459, 460, 461, 462]

n.segments.loc[489]
geometry LINESTRING (1574717.4578 5190383.166, 1575107....
to_segnum 459
from_segnums {492, 502}
cat_group 511
num_to_outlet 7
dist_to_outlet 7635.91492
sequence 441
stream_order 2
upstream_length 2272.680043
Name: 489, dtype: object