Fillet component problem

A fillet component has stopped filleting in my Grasshopper definition and I can’t seem to figure out why.

I’ve joined together 3 curves and tried to fillet the sharp corners. This has been working correctly for the last couple of years but has stopped working now and I’m at a loss as to why.

I’ve extracted the components into a very simple definition which shows the problem.

I suspect there’s something simple that I’m just not understanding.fillet (2.5 KB)

I can repeat that, not sure what’s wrong yet.

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I added a YouTrack item for this.

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Ok so I’ve been working on other parts of the same large definition in which this problem occurred, and now the problem is gone again.

Very confusing but here’s the same two components with the fillet now working fillet problem (2.5 KB)