when i placed acacia fences by fill command they repeatedly didn't connect together
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It looks like it is related to MC-135215
Duplicate of MC-129367

It still works on minecraft 1.14.4 (tested on vanilla server with no plugins)
[media]
I recreated your setup as good as I could, used fill for the acacia fences, and it worked fine for me:
[media]Are you using any mods? What was the exact command you used? Any possible details that could be missing?