1. problem: The particles of the barrier-block are "broken" lava particles
2. problem: The particles are displayed behind the block (This bug appears with every other block too, but isn't mentioned for barriers in this bugtracker)
To see what i mean, have a closer look on the screenshot.
Duplicate of MC-46427 - 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.