When looking at the sea through the window of any building (I have attempted this with at least 10 different buildings from both Arma 3 Vanilla (no mods/optional DLC enabled) and custom assets) the glass texture is no longer visible when the sea is present in the path of that glass. The first image below is on a custom map/modpack, the second image is on Altis with no mods, and the third image is Tanoa no mods
https://i.imgur.com/hYEjrqB.png
https://i.imgur.com/hOPVxyn.png
https://i.imgur.com/CMc9RA3.jpeg
All of these images are using the model "Land_i_House_Big_01_V1_F" but as mentioned, this happens in every single building I've tried this viewing issue on.
In this last image, the issue is much more visible. Notice how the center of the image vertically is still complete as the tree in the background is in front of the visible water while the rest of the glass texture just completely disappears: