So, just to follow-up on this thread.
I took a quick look at the Yamaha parts website, and it looks like all current (and older) models use the same drain assembly, F2D-U2290-00-00, for the locker drain. Mine is missing the inner flange, just like
@OUT ON THE REEF shows in his video. So far, we know of this problem on a 210, FSH, and on my 240. You might want to check that your anchor locker/bow drain is properly assembled.
For reference,
@Ilmmct sent me a pic of the drain from his 2013 242 LS (same part number), so this is what it should look like (flange sealed to inner hull) from the inside of the anchor locker:
View attachment 49526
This is what mine looks like (missing the inner flange):
View attachment 49527