1 fist place non-full block
2. I'm pouring water
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As @unknown said. This is intended because designing water to be able to flow in non-waterlogged waterloggable blocks can cause contraptions making use of the old water physics law built before 1.13 to fail.
See MC-129009. Actually this ticket is a duplicate of it.
Isn't this intended behaviour? Water isn't supposed to be flowing into transparent blocks by itself, it can only be placed as source inside of them. They once planned this at the beginning of Update Aquatic hype, but it got reverted soon (as it would have broken too much existing behaviour, I guess).
If this is about something else, please clarify your issue with a little more context.