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Which Nazca version are you using? I can not reproduce the asymmetric result. Would you have a short piece of code generating the guides like in the picture you attached?
The sbend_p2p() has by default a fall-back option (keyword bsb=True) where it draws a bend_straight_bend_p2p() interconnect if for some reason the sbend did not return a valid solution. This is what the left interconnect in your picture looks like. If you set bsb=False Nazca will connect the points with a straight line in the error layer. These events are also recorded in the Nazca logfile, which you can activate like
import nazca as nd nd.logfile(__file__)
By default, the horizontal line of the sbend is in the direction of pin1. This horizontal orientation can be set/changed via the ref keyword if needed. The sbend_p2p will automatically add extra bends in the pin1 start and pin2 en points to accommodate the sbend_p2p under the ref condition, e.g. ref = (0, 0, 20) to place the sbend straight section under 20 degree w.r.t. the local x-axis. Setting ref to pin2 will use pin2 rather than pin1 as reference.