Steps I took that resulted in the problem:
Export Gerber files through CLI. About 50% of exports have the copper top layer destroyed. I used the chaser light as an example project.
Please see attached screenshots for valid and invalid output. This only happens to copper top layer.
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What I expected should have happened instead:
Export of proper Gerber files for production.
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My version of Fritzing and my operating system:
Linux x64 with current version of Fritzing. Tested on Ubuntu 16.04 LTS and Linux Mint.
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I already created an issue on Github but got no answer yet. https://github.com/fritzing/fritzing-app/issues/3288
Attached to the Github issue is also an Ruby script to reproduce the issue.