How to dissolve outer edge from imported dxf

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Hi guys,
So I imported dxf from sketchup. I have there separate group for the mesh I made there from cad file. When I import it to Houdini it has this white edge around it. And I can not get rid of it. If feels like its separate (in group selection it is separate), but no matter if I blast it or dissolve it it just ruins the mesh - it deletes edges. I've tried Fuse, Clean, PolyDoctor - nothing helps. The only solution I came up with was to inset it a bit with polyextrude and then deleted the edge. Is this a normal approach? Is there any other elegant way doing it? Am i missing something? Or this is dxf thing and there is a way to deal with it? Thank you in advance for your time. Cheers.
(screenshot attached)

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Screenshot 2022-09-25 005053.png (1.9 MB)

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Hi,

Is there a way to post a sample? I think I saw this before but can't remember what I did without looking at the geo.
Senior FX TD @ Industrial Light & Magic
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