Affects Version/s: Minecraft 1.13-pre6, Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13-pre9, Minecraft 1.13-pre10, Minecraft 1.13
Fix Version/s: None
Discovered while testing a similar, recently-fixed bug which I also could not find.
1. Create the setup shown.
2. Use bone meal on the seagrass.
The flowing water block above the seagrass will now be a full water block.
Ideally, either the bone meal should not work at all, or the block on top should remain flowing water while still containing top-half seagrass.