Csg subtract problem

Questions
1

I have two customMesh objects and I am trying to subtract using csg, but I get result errors. I would be happy if you help.
Note: English is not my native language.

my playground : fff | Babylon.js Playground (babylonjs.com)

2

Is the half cylinder mesh completely closed? I can see the inside from the bottom. This might be the reason.

3

İt’s worked like this, I have no idea how it works.
fff | Babylon.js Playground (babylonjs.com)

4

var indices2 = indices1.slice().reverse(); This has improved thanks to the line of code.
before => var indices2 = indices1.reverse();

thx for helps.

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