Haven't had this happen before - Cannister pre-filter full of water!!

Today I did the 28k mile service on our 2021 F3L. I know a lot of people don't bother changing out the canister pre-filter. Well, imagine my surprise when the original filter was full of water! I don't mean a little bit, I mean FULL. I can't imagine how this much water was able to get in there. Yes, it's driven in the rain, no it's never been pressure-washed. Since I've changed these on RT's before and never seen water, I imagine that the mounting position has something to do with it. On an RT, the filter is mounted vertically near the left saddlebag. On F3's, it's mounted horizontally behind the driver's seat.