For some reason, sometimes when I copy/paste a symbol or a group of symbols, it creates a new symbol in the symbol page which creates a huge mess and I end up having the same symbol many times. I disabled the renaming feature so they all have the same name. How can I avoid this? 

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Update — This was a bug and is [now fixed in 43.2](https://www.sketchapp.com/updates/):

>Fixes a bug where copying and pasting Symbol instances could duplicate their master