A barrier block placed underwater cannot be viewed by a player above the water, even while said player is holding a barrier in their hand.
Similarly, a barrier block placed above water cannot be viewed by a player underwater, even if the player is holding a barrier in their hand.
Bug does not exist when "Fabulous" graphics on.
Related issues
is duplicated by
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Can confirm. Fixed in Fabulous. However, still happens in 1.20.3pre-2 without Fabulous graphics.

This issue is not valid on non-fabulous settings. Again, fabulous is to fix these, that they exist in non-fabulous is won't fix/invalid.
Rendering issues like this are only accepted for Fabulous graphics setting; it's specifically added to fix these kinds of bugs. This is fixed in fabulous.