We just completed our DC > Cloud migration and noticed that on a single project's page, the Board tab is showing zero issues across all of the columns. The project is a Company-managed "Business" project. Also checked and confirmed that there are no filters being applied.
However, as soon as we flip over to the List, Issues, or even Timeline tabs all the issues in that single project do show up -- which confirms all the existing issues within the project.
Here's a screenshot of two tabs side-by-side:

I did also confirm that if I manually create a Kanban board with an underlying JQL filter for just this single project, then all the issues do show up on that board.
It just seems very unexpected that within the project's page that the Board tab just isn't showing any issues at all. Did we miss something somewhere?