press f1 and look at water in a cauldron, not transparent.
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Cauldron water is not transparent at all to me either.
Issue relates to MC-9266.
Confirmed, attached debug crash incase it's graphics card related.
Water in cauldron don’t has transparency at all – Under no circumstances. (At least for me … I never saw transparent water in a cauldron with any graphics settings)

Resolved as duplicate of MC-9266
Cauldron water is never transparent ?