Use a piston block swapper to push a magma or soul sand block where the other block used to be.
The bubble column will never update.
So what happened is I made a block swapper trying to create a switchable up or down bubble column, but the column is stuck as an "up" column, even though there has been a magma block at the bottom of it for (real life) days.
Environment
I noticed this issue in 1.13-pre1 and it isn't fixed in pre2 so I thought I would post a bug report.
This occurred for me on a SMP server. I haven't tested it in single player. I'm on Windows 8.1
Linked issues
duplicates 1
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