Making aircraft CSG liveries on Roblox is a nightmare sometimes

Hello, as I said in the title CSG liveries are completely nightmare.
I was negating the tail to make a CSG livery and got this.

Why does this happen and how can I avoid it and make life doable?

The error says it all. This usually only happens when you negate everything.

Well I am not negating everything.
As you can see
image

Hi! Would you mind sharing the place file including the problematic union parts so we can investigate it? Thank you so much!

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I will create a new place File with the same Union and Negates