It can happen also underwater.
Does "MC-128690 - Water does not flow sideways when there’s no block below it" describe your issue?
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.
Reporter: Petr Pesek
Assignee: (Unassigned)
Created: 2018-07-15T16:07:35Z
Updated: 2025-04-14T23:43:24Z
Resolved: 2018-07-15T17:54:18Z
ADO:
Confirmation Status: Unconfirmed
Area:
Mojang Priority:
Category:
Labels:
Affects Versions: Minecraft 1.13-pre8
Fix Versions:
Retrieved 2025-06-11T09:47:50Z
Does "MC-128690 - Water does not flow sideways when there’s no block below it" describe your issue?