Summary:
It seems to happen randomly. When breaking waterlogged blocks, it is sometimes possible to change the color of the water as in MCPE-123373.
Steps to reproduce:
Place 2 sources of water in length.
Place 2 waterlogged blocks in the 2 water sources.
Break 2 waterlogged blocks quickly.
Repeat step 2 and 3 if the water does not become lighter.
Observed results:
You will be able to achieve the effect of lightening the water.
Expected results:
The water will not change in any way.
Video:
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Updated description as the problem applies to all waterlogged blocks.