Chart sheet keeps getting removed when editing a file
Hi there, I'm running into an issue which can be reproduced with this attached file: [buggy.xlsm](/uploads/43c98686abe69e692208e78d497ca0d3/buggy.xlsm) I'm not even editing the file, all I do is load and save as such: ``` wb = load_workbook('buggy.xlsm', keep_vba=True) wb.save('INTERNAL_TEST.xlsm') ``` And when I open the new file, I first get an error about the file being locked: ![image](/uploads/ab5d17d3f2d47116f7a9ce8354214314/image.png) And then when I bypass, I get another alert saying that my chart sheet was removed: ![image](/uploads/20a49e9968e35360a1c70bc043a0a45b/image.png) Any idea why this is going on? Thanks!
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