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Update: I have updated Blender and used the Manifold option as suggested in the comments by @Lutzi and it worked! Thank you for your help!

I have been trying to set up a similar animation by following this YouTube Tutorial: https://www.youtube.com/watch?v=TarT11HWHyU&t=8s

Only my affected object is a pumpkin and I am trying to keyframe a Null-Object to follow after another object to graudally remove the front of the pumpkin-mesh.

The problem occurs in render: The ico-sphere used in the geometry nodes appears in some frames. I have tried checking hole tolerant but it did not help.

attached the geometry node setup and the render result.

Any ideas why this might be happening?

geometry nodes with Mesh Boolean render result with visible ico sphere

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    $\begingroup$ If your meshes are manifold, then the Mesh Boolean node should be of type manifold (not float). That would be the most stable solution. $\endgroup$ Commented Oct 19 at 22:37
  • $\begingroup$ Dear Lutzi, thanks, I will try rendering it again with the exact option. $\endgroup$ Commented Oct 20 at 17:05
  • $\begingroup$ Note that this isn't about rendering but about geometry/mesh/topology. The manifold option is stable, more reliable, and also faster to compute than the exact option. $\endgroup$ Commented Oct 20 at 17:30
  • $\begingroup$ But it does not offer me the manifold option. Do I need to activate some extension for that? $\endgroup$ Commented Oct 20 at 17:35
  • $\begingroup$ Ok I think I need to update my blender... $\endgroup$ Commented Oct 20 at 17:44

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