Issue on Isosurfaces computation

[eliserd]

Hello,
I have sometimes some problem with the Isosurface computation which is incomplete. For example, I will have this map (in green)

instead of this map (in red)
.

Do you have any advice on what could be the issue ?

On the same geographical area I had a few instance of this error :
"[main] INFO org.noise_planet.noisemodelling - Start : Compute Isosurfaces
[main] INFO org.noise_planet.noisemodelling - inputs {resultTable=NO5_GEOM, isoClass=25,50,100}
[main] ERROR org.noise_planet - unable to assign free hole to a shell [ (448362.2250452859, 4476349.7667742465, NaN) ]
org.locationtech.jts.geom.TopologyException: unable to assign free hole to a shell [ (448362.2250452859, 4476349.7667742465, NaN) ] at org.locationtech.jts.operation.overlayng.PolygonBuilder.placeFreeHoles(PolygonBuilder.java:185) ...." .
error_isosurface_example.txt

I imagine this could be a related issue but in that case the calculation stops and does not produce any map. In any case, I am also interested to know if there is already an easy way to fix the second error.

Thank you in advance for your help !