When viewing ice that is in or under water, the flowing-water texture take place on the sides of the ice, and the ice texture itself is not visible. This does only apply to ice. Neither packed, nor blue ice appears to have this issue.
When you look at ice from under water it is not there
Some partial blocks that don't pop off when underwater, cause water to show flowing animation at the sides
Highly transparent block edges on ice, slime block and honey block