I have 15 issues in my current sprint in the Plan Rapid board, but when I switch to the Work board, and I have swimlanes set to "Epic", then I only see 2 issues on the Work board, and it does not show the Epic name to the right.
If I switch to swimlanes by "Assignee" or no swimlanes, then I see all 15 Epics in the Work board.
Also in the Plan board, I do not see any Epics down the left-hand side, even though when I look at the board filter lots of issues have Epic Links.
Note I did just separate out my project into 2 boards, 1 with component != Testing, the other with component = Testing.