I am actually playing on a Mac Mini, but did not see that in your devices.
There seem to be waterfalls appearing when a chunk is loading for the first time.
I can hear the water too, but when the chunk loads in the water goes away, along with the sounds.
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Please do not mark unreleased versions as affected.
You don't have access to them yet.

Thank you for your report!
However, this issue is a Duplicate of MC-138108.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
Please, next time create reports in the correct project.
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Moved report to MC, therefore affected version might be incorrect

I did search and did not see anything. My apologies. I am positive the affected version is correct. 18w46a