I created a simple board filter that displays all of the items in the Epic DAPR-2124.
"Epic Link" = DAPR-2124
As shown below, it works as a filter. However, their are no results shown under the board. There are also no obvious sub-filters that would cause items to be removed.
My guess is that your board columns of in-progress and done do not include the "backlog" status. So there's nothing to show on the board, because all the issues are in that status.
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