There's a gap between the textures when it's flowing down into a lava lake
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This actually appears to be a duplicate of MC-105732, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.
Please provide a screenshot of this occurring with your F3 debug screen enabled.