Lumen in interior

I´m working on my first game in UE5 and I have problem with lighting or with Lumen.

I have weird black glitch if I run arround the corner. I don´t know if I have some settings wrong or where is the problem. I tried some solution which I found but nothing helped.

The walls are from small blocks, but they have overlaps, but if I make small room from these walls without light inside the light still goes throught in Lumen Scene view. I tried make these walls thicker, but this didn´t help me with black glitch and also I need these walls to be 5cm thick.

Is there any solution for this? Thank you.

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