Water sources placed above other water sources using a bucket do not fill the area with more water sources like they did in older versions. It does seem to work with the /fill command, however.
Related issues
Attachments
Comments

[media]
Water sources placed above other water sources using a bucket do not fill the area with more water sources like they did in older versions. It does seem to work with the /fill command, however.
migrated
(Unassigned)
Unconfirmed
Minecraft 1.13-pre1
Retrieved