[MC-133602] Infinite water does not fill up every area

It can happen also underwater.

Related issues

migrated 2018-07-15T16:07:35Z

[media][media]

D 2018-07-15T16:51:14Z

Does "MC-128690 - Water does not flow sideways when there’s no block below it" describe your issue?

[Mod] Neko 2018-07-15T17:54:18Z

From first release 1.13

Assuming this means 1.13-pre1, your issue is MC-128690. If you're using 1.13-pre8, your issue is MC-12363.