There seems to be a visual bug introduced in the update that causes you to not see raindrops at all. I'm not talking about the curtains of rainfall you see off in the distance or the effect on the windshield. I'm talking about the raindrops that you could see close to you (represented as stretched pixels I believe). They're not even lit up by light sources anymore. I saw a guy mention it on FB then I tested it and found that I also had the issue.

It’s a flight sim not a rain simulator 😀