When I press . or , in the task panel, to move the selected column past the first/last column, the application fails with the following "index out of bounds"-message:

$ zenith
thread '<unnamed>' panicked at 'index out of bounds: the len is 12 but the index is 13', src/render.rs:314:5

The issue can be reproduced consistently.
I'm running zenith 0.12.0, from the "zenith-bin" AUR package.