Current scenario

When using converting a Confluence page from legacy to the Cloud editor, sometimes the legacy content macro displays the content of a legacy macro(for example, the note macro) in plain text.

As per its documentation, this is by design:

This allows the content to be edited and reconfigured without losing any data. 

Suggested solution

Add an option to select how to display the data from the legacy content macro.

Workaround

Please consider updating the page to a similar layout and supported page configuration.