Occasionally I have the same problem in HM with some meshes from GMSH. A solution I found for me is to look at which Plane Surface the Element belongs to. Then I have to reverse the order of the Curve Loop of this Plane Surface: Curve Loop(1) = {1, 2, 3, 4}; → Curve Loop(1) = {4, 3, 2, 1};
If OGS then complains about another element with negative det J, just repeat the procedure.
This solves the problem for me at least.
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