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When trying to reopen my file after a browser restart, I get the following error:
Half of the contents of the file seem to be missing/replaced by sliders.
Is there any way to recover more of the file, or at least figure out what caused it in the first place?
The same problem 
It seems I have solved it by explicitly opening the file from the Classic app/the Geometry app. It would be nice if the error message could indicate something along these lines, e.g. "Command xxx is only available in xxx, try opening the file with that instead".
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