In Office Open XML documentation there is element named "AlternateContent" which can contain image. Currently the content inside the AlternateContent element is skipped.
Hi Tim, Thank you for sharing your feedback. The task is currently not scheduled for implementation and I cannot say a particular timeframe when it might be available. Continue following this item so you can receive updates when its status changes. Regards, Tanya
Please include this "fix" ASAP in next release as it appears as a bug to my users when data is missing upon import.