The bug
The problem that blocks remain depending on the order of updating blocks of the fill command.
(Old name: /fill lava bug
Old description: When replacing water, lava and obsidian with lava with /fill, not all can be replaced.
I checked this bug in 1.12.2 and 1.17.1.)
How to reproduce
Create a space of 2 by 2 or more(Height is 1 or more)
Fill the space with lava (r1.png)
Put a block of water in the lava (r2.png)
Replace all with lava with /fill (r3.png, r4.png)
Linked issues
Attachments
Comments 7
I expected what was going on.
I think the fill command places blocks and updates surrounding blocks in order from the north and east corners.
This is the same type of problem as MC-187732.
Thank you for your report!
We're tracking this issue in MC-31100, so this ticket is being resolved and linked as a duplicate.
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Seems similar to MC-187732. Would this happen to describe your issue?