Much like any full block doesn’t support transparency and any transparent pixels get covered with white, the barrier block doesn’t support opacity and replaces all opaque pixels with transparent ones. Likely intended.
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Unless I misunderstand the issue, I cannot reproduce in 23w41a. After changing the barrier block model to use "cube_all" and changing the barrier texture to low opacity, it seems to work:
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The pack:
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Barriers, like air, cannot get a model applied, only the particles can be changed. The fact it can't get a model is not a bug (for mods, if you want a source, you're going to have to search through the slack messages, it was spoken about during my mod days).
I think this might be MC-164001, though barriers are not listed as affected.