(Win beta 1.0.021) Render as Image screen artefacts
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I'm not fully sure what the option 'Render as Image' does, but I'm fairly sure it shouldn't do this (see screenshot below).
To repeat this:
- draw three rectangles
 - Object > Rasterize
 - Right click and select 'Render as Image'
 

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@Jono Yes, it should not do that. Looks like a bug.