Water problem with addon: NZMF Milford Sound Region Airport (by NZA Simulations)

I’m not sure if the following effect is related to the change in water body polygon behaviour, but when flying out of NZMJ with the “NZMF Milford Sound Region Airport” marketplace add-on by NZA Simulations installed, the river that leads inland from this airport appears to have two different water levels, higher along the edge, with a deeper section running alongside the edge where the water dips down.

If the add-on is deleted using the content manager, this water distortion no longer appears. When the add-on is installed again, the effect returns.

This is with the Microsoft store version on Windows 11 24H2, on a gaming laptop running a Geforce RTX 3050 Ti GPU.

My graphics settings are as follows: