Barrier blocks placed underwater have flowing water texture on the sides exposed to water, but not the top. As per the behaviour with glass blocks, the sides of the blocks should not have a flowing texture, to provide a sort of invisible barrier to water.
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Thank you for your report!
However, this issue has been closed as a Duplicate.
It has been linked to MC-93312. If you have additional information, please add it to the duplicated report.
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