Substraction mask over a group


I’m trying to substract a shape over a group of several other shapes, but for some reason the substraction mask is only applied to the last shape within the group.

Here are my shapes, and here’s the result I get after I’ve applied the mask :

I’ve got intersecting lines and I would like to hide the inner, intersecting part of them. I drew a circle (in red in the picture) and I tried to add a substracting mask, but only the last line within the group is visible. The others are not. However, it works fine if I flatten the group into a single Vector, but I would’ve liked to keep my group as is so I can edit the lines individually if needed.

How can I achieve this? Thank you.

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