Copy/pasted content in InDesign 2021 is importing in un-editable format
I am trying to copy and paste content (text frames, tables, objects, etc) from an InDesign file that was created in the 2020 version, into a new file I created from the 2021 update. The pasted content is coming in as a graphic element, so it is not editable like it used to be. This is true even for a simple text frame - it behaves like an image when pasted into the 2021 file. I've looked to see if there's a "paste special" that may solve the issue, but I cannot find anything.
Does anyone know how to mitigate this issue? Is this something that has intentionally been changed in the upgrade to 2021?

