When a player stands in powdered snow, they can begin to take freezing damage. The same does not apply if a player is standing in a cauldron filled with powdered snow. This is not consistent with the fact that players can take damage from a lava cauldron as if they were in a normal block of lava.
Similarly (although probably less importantly), a player inside a water-filled cauldron with their head underwater does not begin to drown. This can be achieved by pushing a block on top of a cauldron with a player inside it to initiate swimming mode, or by closing a bottom-half trap door placed on top of the cauldron.
Environment
Java 17.0.1 64-bit, Windows 10 OS.
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We're tracking this issue as MC-205045, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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