When you sneak from a block (like a stone block) to a powdered snow block, it stops you from walking onto the powdered snow like you are sneaking off the edge of a block. This is probably an oversight.
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I'm quite certain that this is intended. When holding the sneak key, it will not allow you to fall off any blocks when sneaking on the edge of them however, I can confirm regardless.
Seeing as it got a Mojang priority, it probably is not. You'll also need a source for a WAI resolution, and only mods and Mojang can resolve the report.
Seems like intended behaviour. While sneaking the game prevents you from walkin onto, for example, cobwebs. It is reasonable to think that powder snow acts similarly.