Paddy stops working with Symbols within a symbol. Sketch 49.3
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### Bug report
#### Expected behavior:

When creating a nested symbol with symbols, the nested symbols with paddy on them stop working on the overrides.


#### Actual behavior:
(Please include a screenshot or screen recording if possible)


![screen shot 2018-05-01 at 2 56 28 pm](https://user-images.githubusercontent.com/30295511/39491000-63f675b2-4d50-11e8-8699-c25eff031010.png)
![screen shot 2018-05-01 at 2 56 14 pm](https://user-images.githubusercontent.com/30295511/39491011-6c537412-4d50-11e8-83b4-dd1814de521f.png)

#### Steps to reproduce:
(Please attach a Sketch file if possible)


