For non-solid, transparent blocks, while the player is looking at the block, the outer pixel gets deleted, allowing the player to see through it. This gives the block a very strange look. It is most obvious for nether portals.
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Duplicate of MC-162519

@Mish: Wrong duplicate again.

Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-187598, which is a report that has not been resolved yet.
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Is it?