I found a bug with a barrier. The bug is that in version 1.20.2, if you pour water on the barrier, it will fall into the barrier, and in older versions, such as 1.17.1, water will spill next to the barrier.
MC-265621
Barrier blocks can be waterlogged by players in Creative mode
Resolved
Works As Intended
0
Thank you for your report!
However, the issue you have reported is working as intended.
This behavior was intentionally added in Version 1.20.2, as detailed in the changelog:
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