There isn't much to it. there's no drinking sfx when trying to drink milk or any potion, but splash and lingering potions still make the crash sound.
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Thank you for your report!
We're actually already tracking this issue at MCPE-38340, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
This is a duplicate.. whoops.