The bug
For context, in 18w10c, flowing_water and flowing_lava were removed, along with the introduction of new water physics
When converting a world to 18w10c, flowing_water
and flowing_lava
aren't replaced with their new counterparts, leaving some air pockets under the liquids that won't go away until they are updated.
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As it turns out after some testing, it's a different bug entirely; what's shown in the screenshot happened when dead_coral got split into the 5 different types of dead coral blocks. I don't see that as reported, and frankly don't know if it's a valid bug to report.
Is this still an issue in the current snapshot 18w19b or newer ?