I lost some list after using Sqrt function

Please see the screenshot of the situation.

Is there something wrong?

By the way, I can’t find a node that I can use to chamfer/fillet wire. So I’m making one for myself. It is still inconvenient to use because containers don’t work properly in other ones. Is there any node like this?

Can you please provide a simple project reproducing the problem?
For now you there isn’t a node available to apply fillet on a wire

When I use mapmutilist as in the screenshot. The lists will lost in some math nodes.
Lost List.zip (4.7 KB)

Thanks for the file, we’ll take a look a the problem.