Map functionality is not displayed in hand, offhand, or in item frames all maps view as blank
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Thank you for your report!
This issue has already been mentioned in the list of known issues, so we won't be tracking it in JIRA: http://aka.ms/rtxbeta
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I can confirm this - the "discovered" areas of the map are flashing and the map doesn't show at all. I uploaded a game capture of the issue.