OK - the disconnect here is that the release wasn't marked as released. I had thought that if the release was showing a release date that it was released.... Problem solved. Question answered.
We don't use Bamboo, so I followed the steps here:
Issues that I have assigned to a version and have released are still on the board. This is the problem that I need to solve. Per the answer to the other question, assigning the issue to a version and releasing that version should cause the issues to be cleared from the board, but that is not what we've experienced.
Here is the "work sub-filter" I am using:
This works as follows:
In regular English my filters says:
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