When a linked text frame is placed on the page, it updates its contents when the parent linked text frame changes. But if one copies that text frame and pastes it inside a text thread, it appears to have a link icon, but the link is actually broken and will not update with the parent text any more.
I am trying to use this to have a callout box for a construction procedure that is duplicated is several places in my document. I want them to be inline of my text as other instruction steps will change, and reflow the layout, and I need the content to be inline where the user will need to see the sub-procedure when they perform the actions.

This may be similar/same as: https://indesign.uservoice.com/forums/601021-adobe-indesign-feature-requests/suggestions/32420425-enable-copy-paste-of-text-text-frames-without-br