This is in fact a bug, the fix for which landed in master 11 days ago [0]. I was a bit surprised to find it was not in our 20.08 release. So I am back-porting it to 20.08 now [1]. That should take about a day to land and become available in cs:openstack-dashbaord.
[0] https://review.opendev.org/#/c/747115/
[1] https://review.opendev.org/#/c/749393/
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David Ames