Hi Sander,
I don't know if it helps but I think both cases are correct.
In the first case the active image is L, so is not shown because L do not have mask, if you click on the main image it should be shown as active.
The second example is a preview, I think that task bar always displays the information related to the last image selected that in this case has mask and so is active, whether you select do not show in the preview window.
Saludos. Alejandro.