Relates to MCPE-243302.
If you use /setblock to place a frosted_ice block, or generate them through Frost Walker, then break them, they produce the legacy glass sound, rather than the new sound used for ice.
Expected results: we would hear that sexy new ice sound.
Actual results: it just sounds like old ice.
It makes more sense to just merge this issue into MCPE-243302, so I'll be resoving this one as a duplicate. Good find!