I know you filed a case around this but I wanted to respond here as well in case other users in the community experienced similar results.
At the moment, xlsx charts rendered incorrectly in the preview screen, this is due to a bug in LibreOffice. Unfortunately, there is not currently an ETA on the fix since the bug is with the LibreOffice Engineers rather than our Jive Engineers.
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Is there an update on this issue? We have users reporting this issue now. Thanks.