Missing part of map in c2a5a The Dam

Hey all, so, first post here. I’ve seen this bug for ages, but only am just posting it now.
If this has already been suggested, then please excuse me.
Otherwise, here is the problem in the first map of Surface Tension (c2a5a):

As you can see, pretty huge empty spaces in the map underwater.
Thank you!

This has already been reported as a bug. Thanks.