at com.alibaba.fastjson2.writer.FieldWriterStringFunc.getFieldValue(FieldWriterStringFunc.java:36) at com.alibaba.fastjson2.writer.ObjectWriterAdapter.toJSONObject ...
Thank you for your report. The cause of the bug has been located, and it will be fixed in the next release. In the mean time, if you rerun all your simulations you will be able to save your design.
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