[] Standing under Pergola makes rain disappear

The title is self-explanatory but it appears that standing under the Pergola makes rain and thunder disappear as if you’re inside a building.

Steps to Reproduce

Stand under a Pergola outside with rain on.

What I expected to happen

I expected the Pergola to not act like this and just act as a simple shelter with sound remaining normal.

What happened

Nothing much, just reduces the impact of being outside with the Pergola.