When You Are In Creative And There is lava and you place lava bucket to the existing source it shows that old lava breaks with partickles, picture explains how it shows it.
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This happens in survival too. And I have found that this happens in any lava, flowing or source.
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Here is an example of the particle bug.
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Please do searches on this before you post a bug... this is a duplicate of about 50 bugs reported just in the past 3 days
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[Mod] Tails added a comment
Duplicate of MC-18365, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.