Right-click on header/footer usually does nothing. If we double-click them we enter their edit mode. After we close header and footer and right-click on them we get context menu as if we are still in edit mode. If we scroll out of view of header/footer, and then back in, right-click will again do nothing.
Also, separate but similar bug, in demo document's footer there is a three-column table. It is possible to resize with the mouse all the columns widths, and even the row height. Mouse will change shape, as if in edit mode. It is not necessary to enter and leave edit mode like in previous case, the error is observable from the start. But if we scope out and scope back in the changes are undone, in a way like in previous case.