EasyEDA is making invalid contours.
According to the gerber format specification section 4.6.1([https://www\.bosco\.co\.za/DownloadDocs/The\_Gerber\_Format\_Specification\.pdf](https://www.bosco.co.za/DownloadDocs/The_Gerber_Format_Specification.pdf)), contours must be closed.
EasyEDA is making open contours.
That breaks some 3rdParty gerber tools: [https://github.com/pcb2gcode/pcb2gcode/issues/577](https://github.com/pcb2gcode/pcb2gcode/issues/577)<br>
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Firefox
87.0
OS X
10.14
EasyEDA
6.4.19.4