Issue with Coastline in .GeoJSON Format

[niluhputujiesta]

Hi there, I'm experiencing an issue with the generated coastline in geoJSON.

For context, I was able to generate 9 coastlines for a beach in Krabi, Thailand. Visualization with matploblib shows results similar to the reference (albeit a few tweaks are required), but when I import the coastline in geoJSON, it seems that new connections between points were established, forming lines crossing the domains, as shown on the second picture. I have tried exporting the coastline in points and turning them into path using a tool in QGIS, but the problem persists. I also made sure to export the coastline using the same EPSG number so I don't know what the issue is. Let me know if anyone has encountered the same problem, and have found a way to troubleshoot it. Thank you for the help !

[niluhputujiesta]

For context, this is the reference coastline, and the coastline visualized in matplotlib

[kvos]

there is no issue here, that's the way the shorelines are exported by CoastSat, as points. I think that to link points to create linestrings is a non trivial problem. There may be some solutions out there. Can't you work with the points layers in QGIS?
There could be a way to get to lines somewhere in the process but it will be more complex.