Particles produced by torches (untested with other particle-producing things) appear to fly off at hyperspeed towards the west, producing what at first appears to be flickering lights in the distance.
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Duplicate of MC-2497. Please search before you post.
I did search - it just didn't come up, presumably because the keywords I searched for were not listed as tags on that one.
Confirmed. Rather distracting when sprinting along a mine tunnel with torches placed along it.