If only it were that simple. Water runs fast for me normally. I've been around and under water during testing a lot in the last several months. It has never acted like it did during the stream.
Bugs that rarely happen on your own computer are often very hard fix.
Like I found a way that backpacks can be lost and can reproduce it fairly well now, but I needed to add code to move the backpack constantly to make it happen regularly. The reason the bug was so hard to find is it requires the backpack to move between chunks as the chunks unload and chunks save. That stuff is complicated with 2 different threads and after debugging all day, I still am not sure what is going on other than the chunk the backpack is in does not always save. Hopefully get that one fixed Monday.