Werid problem creating a Hole with Negate + Union

I have this platform, and I placed a block in the middle of it.

Next, I used the Negate tool on the block,
selected the platform by holding Ctrl and clicking,
and then pressed on “Union.”

This created a hole in the platform, as you can see.



However, I’m confused about the hole’s behavior:

The Area wich is green, is the acutal hole where you can jump into.
The Red Marked Are is like a barrier?

Why?

Can you separate the parts and show what it was like before you made the union

Don’t use union operations for something so simple.

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Set it’s collision type to precise.

Or

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The collision fidelity of the union is lower res than what you expect. This happens often when using large unions or meshparts, or if they have complex geometry. You can view the collisions geometry by enabling the setting in Viewport Options.
image

Change CollisionFidelity property of the union to be “Precise” and it will likely be more accurate.
image

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Yo, I already changed my build,
instead of unions, I just used more parts to create a hole like that.

But I still tested your solution on another platform, and it worked, its a real quadratic hole now.
Thanks a lot!

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