For Multiexcerpt - Cloud: I cannot add a Macro like Expand in a Multiexcerpt macro. The macro gets created outside the table when I try to add it.
This happens only in the new fabric(V2) page editor. It works for the old editor. This is only an issue in Confluence Cloud.
It works for the old editor. Atlassian says, "The legacy editor isn't going anywhere"
Why it Happens
Atlassian has announced that the new fabric(V2) page editor will not support nesting in Bodied Macros. The Multiexcerpt macros are rich-text body macros.