The snapshot changelog claims:
Leave a cauldron outside in falling snow and it will fill with powder snow
However, that does not appear to be the case in some biomes (e.g. mountains) – cauldrons there still are filled with water when exposed to snowfall.
Linked issues
is duplicated by 10
MC-205048
Cauldrons don't get filled with snow even though its raining
Resolved
MC-205080
A cauldron outside in falling snow fills with water
Resolved
MC-205141
Powered snow
Resolved
MC-205183
Powder Snow isn't collected in cauldrons when snowing
Resolved
MC-205231
Cauldron does not fill with snow when snowing in Mountains, instead fills with water.
Resolved
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Comments 6
Relates to MC-93820
I went to an Ice Spikes biome and tested this, placing cauldrons at different heights, and so far, none of them have any snow in them despite it constantly snowing.
Probably the same distinction of snow in snowy biomes vs. snow in cold biomes like with MC-135034.
@Dawn Sunset powder snow is very slow to fill cauldrons, much slower than water(intentional). You probably just didn't wait long enough.
violine1101
coschevi
Only works in biomes that have rain when under certain Y levels. Try it in ice spikes for example and it will work