Hello again!
Thank you for the additional details, managed to reproduce your scenario on my end with it. Indeed, the seam remains visible when using WaterBodyCustom, no matter what settings are altered for it. Checking through the community, there’s no clear solution to avoid the transition at the moment, as the plugin remains in a experimental state.
Possible workarounds involve increasing WaterBodyCustom’s scale way further, in order to hide the seam in the distance, away from the camera. The other option is to work with WaterBodyOcean instead. The setup for that actor is very similar, following a short tutorial:
