Closed curve explosion issue

I had a closed curve. But after the explosion one of the segments gets missing and after joining them back the curve isn’t closed anymore. What’s the issue here?

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Curve explosion issue.gh (6.1 KB)

In Rhino, your curve is a single degree 3 curve which can’t be exploded…
If you want to break apart your curve at the knots, then try to use Simplify Curve, or use SimplifyCrv command in Rhino.

Curve explosion issue_re.gh (12.2 KB)

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Thank you