Unions do not separate

As you can see in the video, the union is having an error when it is separated and when it is time to join other parts together, I need help to solve this error.

This union that I made was 4 months ago, I don’t know if Roblox Studio had any update in that time, which may have reduced the size of the parts but this is bugged.

Does pressing Ctrl+Shift+U work?

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It doesn’t work at all, I’ve even put separate shortcuts, but it won’t work

Hey how do you run studio in the devforum?