Expand macro does not accept more than one nesting level in markup inserting dialog (check attached).

The next markup assumed to be 4 levels, while it is rendered in preview and a mix of level not further than second level. Meanwhile after adding such macro, it is possible to drag & drop Expand sections in page content editor to achieve required result.

\{expand:Level1\}
    \{expand:Level2\}
        \{expand:Level3\}
            Level4 reached!
        \{expand\}
    \{expand\}
\{expand\}