I tested this file https://optics.ansys.com/hc/en-us/articles/360042305354-Edge-coupler and did not find this issue.
I guess it is because for some versions port1 is located exactly at the waveguide intersection, and when in EME you use "full simulation span" sometimes EME may use left or right side of the interface. Please make sure the port is completely located inside one waveguide, not in the intersection.Â
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