Weird light reflection bug while unioning cylinders

I’m working on a hatch door. It has a cylinder in every single corner, making the door have smooth edges.


However when I union them, it seems to be there’s a weird light reflection occuring on the bottom left cylinder:

It acts like it’s unique and so not united with the other parts, resulting a conspicuous “reflection”.

I tried changing it’s color and the material, it’s still there no matter what:

Separately from the other ones, some materials aren’t making it obvious so much, but if you look closely you can realize that it’s still there:

I once thought that there’s something wrong with that cylinder, so I deleted it and duplicated the another one that doesn’t have a weird reflection and put it back. But still when I unioned them it was still there.

I tried restarting Studio and even my PC, didn’t work.

Other edges doesn’t have something like this, it’s only the bottom left one.

How do I fix this?

EDIT: I realized it’s only occuring on the front side of the door, it doesn’t have such a problem on it’s back:

Maybe try negating a very tiny bit from the front of the door to see if the shading issue goes away

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It does, I also realized changing the “SmoothingAngle” property fixes the shading (for some reason). But still, thanks for your idea

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