Navigation keyboard shortcuts (j, k) don't work in Task Board

The usual keyboard shortcuts j and k don't work on the task board.

Note:

• They work everywhere else, e.g. in the planning board.
• Other keyboard shortcuts (like m for adding a comment) work fine in the task board.
• I can neither move up/down nor switch the columns.
• It doesn't matter if I use the Summaries, Cards or List view.
• I tried selecting an issue with the mouse (so that it's highlighted in yellow) before using the keys, but that doesn't make a difference.