1.Bystander perspective

When the player switches to the spectator mode, the problem occurs by switching the second or third perspective:
1. Cubes under the water (hiding the water, but seeing things underwater is more
dark)
2. Hide all collision volumes (the edge line of the collision volume is also hidden
Up, including players)

2.barrier issues

When the barrier block is placed under the water, it will be concealed (created, you (or the player) holding the barrier block is useless

But if you don't look at it, you can see it by using translucent or transparent squares on the left, right, front, back, and bottom.