I think I resolved the duplication bug in 1.6.4 when placing blocks. I found out accidentally when looking at Controls window in the Options. If PLACE ITEM shortcut is the same shortcut as a different command, like for Sneak, or even in Galacticraft, w/ Vehicle Up, this seems to cause it.
Note, check all your control mappings to make sure Place Item is not shared with a different key/button!.
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Note, check all your control mappings to make sure Place Item is not shared with a different key/button!.