If an item is folded and is the last item on the screen (e.g. a focused item), then it’s not possible to select the whole folded item. This shows up as follows:
subhead3 here has items folded under it, but when i Select All or use cmd-B from Heading 1, i can’t select the items inside subhead3.
If i add an item below subhead3, then i can select everything in subhead3