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I did find THIS topic using search, but it appears to be ~1yr old and from what I've seen this appears like it may be similar but unrelated bug.
The beacon light appears to be very thin and missing the main texture in multiplayer server?
However the beacon light beam appears just fine in a single player world.
And the default texture for the beacon beam appears just fine in multiplayer as well.
Is there something wrong/broken with the texture pack causing this only in multiplayer worlds?