Tasks view in Today Pane has wrong size

In the Today Pane, I use various views depending on what is shown in the rest of the Thunderbird window. Sometimes my Today Pane shows ''Events'', sometimes ''Events and Tasks'', and sometimes only ''Tasks''. If one uses the ''Events and Tasks'' view in the Today Pane (left in the picture), one specifies how large the Events section is and how large the Tasks section by sliding a separator up or down. For some time now (since the release of Nebula?) I notice that, if I use the ''Tasks'' view in the Today Pane (right in the picture), the Tasks section does not fill the whole Today Pane, but its size is only that which the Tasks section has in the combined ''Events and Tasks'' view. The tasks used to fill all the space in the Today Pane by themselves, like the Events view still does (middle of picture). This seems like a bug to me. Has anyone else noticed this?