How successful the export process is depends a lot on how well the source PDF was made (under the hood as it were).
Whenever you get what you've shared one can be comfortable in saying the source PDF was not all the good.
To optimize export of PDF content the PDF should be a well formed tagged PDF (e.g., an accessible PDF - as per ISO 14289, PDF/UA which is what defines and describe what an actual accessible PDF *is* - the standard is available for a nominal fee at AIIM).
"Tagged" PDF is, by design, meant to support having accessible PDF and to support useful export of PDF content (all nicely discussed in ISO 32000, the PDF Reference standard).
It is usually happen when the fonts is not supported and not available.
Did you figure this out? I just activated both on my Windows 10 system and got the same result as you.
We apologize for the delay in response and the inconvenience caused to you.
Are you still facing this issue?
If yes, Could you please let us know the following information:
1. Dot version of Adobe application and OS(Win/Mac) you are using.
2. Share the workflow you are following to export.
3. Share the file you are trying to export
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Thanks and Regards,