In short ... By using a command like / fill to remove water from a particular location, blocks other than just water are not cleaned and remain as water sources. Here is an example:
1) I will empty some of the water from this building, preserving only the structure.
2) This is the command I will use:
(It means that I will replace all water blocks with air.)
3) After executing the command, I noticed that there were still blocks of water.
4) Looking closer I could see that it was the blocks of grass that made the bug.
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The summary of the command used is as follows:
"/ fill xa ya za xb yb zb air 0 replace water"
In the example, the water is not gone because there is something besides the water itself.
- is duplicated by
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MCPE-173845 fill and setblock cannot clear water from waterlogged blocks
- Resolved
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MCPE-183903 Fill command problem
- Resolved
- relates to
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MCPE-58121 /setblock air in a waterlogged block places water instead
- Open
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MCPE-104247 "/clone ⋯⋯ masked move" leaves water at original location
- Open
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MCPE-179847 /clone...filtered does not filter out water from waterlogged blocks, and will waterlog any block in target area
- Open