It rains inside

I can see raindroplets coming through while it rains outside. It’s not as much as outside but it still comes through, despite there being 3-4 blocks and air blocks between the outside and the rain
Please take note.

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What material are the blocks made of, that you try to block the rain with?

Also might be caused by blocks being chiseled.
If blocks are chiseled on two opposing sides not only light but also water and weather effects can pass through.