I would just randomly pick up some water on my single player survival world and then it would not auto fill even though there was water all around it.
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Thank you for your report!
We're actually already tracking this issue at MC-12363, 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.

I know, sorry, I tried to search for it but unless I used the same exact way of describing the bugIi wouldn't be able to find it.