I found an abandoned Mineshaft and this fence spawned inside of it with its 'attached arms' out yet there was nothing connected to it.
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The Seed is:-205396693175326374
(I created this world in the snapshot 18w43b btw)
The Coords are: -187 31 -163
Duplicates MC-123087. If this world was created after 1.13-pre7, please provide the seed and coordinates so we can try to reproduce the issue.