"Something went wrong. CSG returned error code -8." What is going on?

Whats crackalackin guys

I’m trying to model a train, and everything has been fine until recently I’ve noticed two issues…

Firstly, when I try and union two (or multiple) things together, it gives me a -8 error and it’s driving me nuts. The way around this is to try and union each union one by one which is like playing a chance game because eventually you’ll be hit with the -8 error again… It’s definitely not the triangle count because I’ve sometimes successfully found ways to union them together.

Second issue is when I separate unions, it doesn’t separate anything. It keeps the union the way it was before but infinitely duplicates the previous operation, so its stuck in an infinite loop of duplicating negativeparts and whatnot.

I’ve not had this issue the months that I’ve been using Roblox Studio before, and it’s driving me nuts. Has Roblox made changes to CSGv3 lately that has bricked it or something? Is anyone else getting this issue?

UPDATE: I’ve found a temporary way around it. Perform the union operation at 0,0,0. Seems to work but a wacky workaround. I also scaled down the union 10x since I’m building this train in like 10x scale. So I suspect its a floating point related issue

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I think you quite literally, need to file a bug report and upload the parts you’re having trouble with. Message @Bug-Support if you aren’t in @AllowBugReports ig

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does the error persist if you move the parts you are trying to union to another baseplate and then copy paste them back into their og file?