Looking through glass. only the mere splash of the fallen raindrops can be seen, as well as the change of the sky. You cannot actually see the rain falling down, only the impact when it hits the ground. This bug affects regular glass, tinted glass, and glass panes (normal and colored).

After some additional testing, it is clear that snowfall cannot be seen through glass either. Once again, this applies to all forms of glass.

(I think I put this in the wrong section, and I'm sorry, I'm new, but the problem still remains. It's on Bedrock Edition, Windows 10. Can be duplicated by creating a world, either making or waiting for it to rain/snow, and looking through any type of glass.)