[Gmsh] Meshing fails without apparent reason

[Bruno Agostini]

Dear Gmsh community,

I am trying to 3D mesh the here attached Schwarz-D surface, but the meshing
fails complaining about boundaries not being recovered, which does not help
me to solve this problem. I think there are no overlapping facets, and the
geometry is not particularly complicated, so I am stuck here. Any ideas?

Best regards

Bruno
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