When breaking a solid block, some of the emmited particles will turn black if there is another solid block right above it.
It seems to me that this applies to the particles of the first block that collide or go trough the second block.
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Duplicate of MC-47683

Duplicate of MC-47683 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Being on this page:
https://bugs.mojang.com/browse/MC
I clicked on "Browse Open/Unfixed Bugs", which led me to here:
https://bugs.mojang.com/browse/MC-387?filter=10613
And since it wasn't there I thought it wasn't reported yet. What is the criteria that makes only certain bugs listed on that page?

You looked at all 2,401 tickets?
Oh, wait! I didn't realize there is a "next page" button... well, it's kinda hard to notice... sorry!